[bilibili] New Year Festa url and variable video formats support

[jc3213]

Checklist

• I'm reporting a site feature request
• I've verified that I'm running youtube-dl version 2020.01.24
• I've searched the bugtracker for similar site feature requests including closed ones

Description

Part 1, Bilibili New Year Festa URL support

The Bilibili New Year Festa [Known as 哔哩哔哩拜年祭] video urls are not supported
URL: https://www.bilibili.com/blackboard/bnj2020.html?aid=78978587

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestvideo[height=720]+bestaudio/best[height=720]', '-o', 'R:\\temp\\Youtube\\%(title)s.%(ext)s', '--download-archive', 'youtube-dl.txt', 'https://www.bilibili.com/blackboard/bnj2020.html?aid=78978587', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.01.24
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: ffmpeg 4.2.2
[debug] Proxy map: {}
[generic] bnj2020: Requesting header
WARNING: Falling back on generic information extractor.
[generic] bnj2020: Downloading webpage
[generic] bnj2020: Extracting information
ERROR: Unsupported URL: https://www.bilibili.com/blackboard/bnj2020.html?aid=78978587
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\generic.py", line 3350, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://www.bilibili.com/blackboard/bnj2020.html?aid=78978587

Even I use the video [avcode] link, it won't work.
URL: https://www.bilibili.com/video/av78978587

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestvideo+bestaudio/best', '-o', 'R:\\temp\\Youtube\\%(title)s.%(ext)s', '--download-archive', 'youtube-dl.txt', 'https://www.bilibili.com/video/av78978587', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.01.24
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: ffmpeg 4.2.2
[debug] Proxy map: {}
[BiliBili] 78978587: Downloading webpage
[BiliBili] 78978587: Downloading video info page
ERROR: Unable to extract title; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\bilibili.py", line 197, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\common.py", line 1014, in _html_search_regex
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\extractor\common.py", line 1005, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract title; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Part 2, Variable video formats support [720P, 1080P+]

I'm using parameters -f "bestvideo[height=720]+bestaudio/best[height=720]", but youtube-dl reports the request format is not available,
URL: https://www.bilibili.com/video/av87033247

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestvideo[height=720]+bestaudio/best[height=720]', '-o', 'R:\\temp\\Youtube\\%(title)s.%(ext)s', '--download-archive', 'youtube-dl.txt', 'https://www.bilibili.com/video/av87033247', '--verbose']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.01.24
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: ffmpeg 4.2.2
[debug] Proxy map: {}
[BiliBili] 87033247: Downloading webpage
[BiliBili] 87033247: Downloading video info page
ERROR: requested format not available
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\YoutubeDL.py", line 807, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\YoutubeDL.py", line 862, in process_ie_result
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpw0w300z1\build\youtube_dl\YoutubeDL.py", line 1635, in process_video_result
youtube_dl.utils.ExtractorError: requested format not available

While bestvideo+bestaudio/best only downloads 1080P, not 1080P+[VIP] for me. I've sent log-in information using -u xxxxx -p yyyyy [My account is VIP too]

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestvideo+bestaudio/best', '-o', 'R:\\Temp\\Youtube\\%(title)s.%(ext)s', '--download-archive', 'youtube-dl.txt', 'https://www.bilibili.com/video/av87033247', '-u', 'PRIVATE', '-p', 'PRIVATE', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2020.01.24
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17763
[debug] exe versions: ffmpeg 4.2.2
[debug] Proxy map: {}
[BiliBili] 87033247: Downloading webpage
[BiliBili] 87033247: Downloading video info page
[debug] Invoking downloader on 'http://upos-hz-mirrorks3u.acgvideo.com/upgcxcode/53/39/148723953/148723953-1-80.flv?e=ig8euxZM2rNcNbhghwdVhoMzhbdVhwdEto8g5X10ugNcXBlqNxHxNEVE5XREto8KqJZHUa6m5J0SqE85tZvEuENvNC8xNEVE9EKE9IMvXBvE2ENvNCImNEVEK9GVqJIwqa80WXIekXRE9IMvXBvEuENvNCImNEVEua6m2jIxux0CkF6s2JZv5x0DQJZY2F8SkXKE9IB5QK==&deadline=1581222648&gen=playurl&nbs=1&oi=3062535427&os=ks3u&platform=pc&trid=97d25758cb26496380efa946fb8289f0&uipk=5&upsig=0c1795e8be994d226087f233808444a1&uparams=e,deadline,gen,nbs,oi,os,platform,trid,uipk&mid=0'
[download] Destination: R:\Temp\Youtube\互动视频【明日方舟】【动画】局部坏死-为何而战.flv
[download] 100% of 10.85MiB in 00:31

I've got the 1080P+[VIP] download url via Bilibili Helper: Bilibili.com Auxiliary, and the link is http://upos-sz-mirrorhw.bilivideo.com/upgcxcode/53/39/148723953/148723953-1-112.flv?e=ig8euxZM2rNcNb4HhWdVhoM3nWRVhwdEto8g5X10ugNcXBlqNxHxNEVE5XREto8KqJZHUa6m5J0SqE85tZvEuENvNo8g2ENvNo8i8o859r1qXg8xNEVE5XREto8GuFGv2U7SuxI72X6fTr859r1qXg8gNEVE5XREto8z5JZC2X2gkX5L5F1eTX1jkXlsTXHeux_f2o859IB_&uipk=5&nbs=1&deadline=1581222769&gen=playurl&os=hwbv&oi=3062535427&trid=a135c4f3cd154259b642c15c7135ea39u&platform=pc&upsig=32b5f8e6846d6941261831c189dab70f&uparams=e,uipk,nbs,deadline,gen,os,oi,trid,platform&mid=27109 and the file size is 16.7MB