Add support for orfium.com

[abominous]

• I've verified and I assure that I'm running youtube-dl 2018.03.26.1

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

$ youtube-dl -v https://www.orfium.com/track/694466/misery-aciou/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.orfium.com/track/694466/misery-aciou/']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.03.26.1
[debug] Python version 3.5.4 (CPython) - Linux-4.15.1-gentoo-x86_64-AMD_Ryzen_7_1800X_Eight-Core_Processor-with-gentoo-2.4.1
[debug] exe versions: ffmpeg 3.3.6, ffprobe 3.3.6
[debug] Proxy map: {}
[generic] misery-aciou: Requesting header
WARNING: Falling back on generic information extractor.
[generic] misery-aciou: Downloading webpage
[generic] misery-aciou: Extracting information
[generic] a281276f-8126-48aa-98ad-9121c282e6eb-1522252311-preview: Requesting header
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://cdn.orfium.com/tracks/a281276f-8126-48aa-98ad-9121c282e6eb-1522252311-preview.mp3'
[download] Destination: a281276f-8126-48aa-98ad-9121c282e6eb-1522252311-preview-a281276f-8126-48aa-98ad-9121c282e6eb-1522252311-preview.mp3
[download] 100% of 2.33MiB in 00:00

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single track: https://www.orfium.com/track/694466/misery-aciou/

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Description of your issue, suggested solution and other information

Site seems to be new, less horrible version of soundcloud.

Generic fallback extractor pulls 1m preview tracks.
Even though full tracks are easily available and scheme seems to be pretty straightforward:
Preview - https://cdn.orfium.com/tracks/a281276f-8126-48aa-98ad-9121c282e6eb-1522252311-preview.mp3
Full track - https://cdn.orfium.com/tracks/a281276f-8126-48aa-98ad-9121c282e6eb-1522252307.mp3

Could not find a single playlist on the site though - every lookup returns empty. Not sure if they are implemented yet.