feat: per-bangumi save path map

[trim21]

close #320

add config option save_path_map

[save_path_map] # per-bangumi save path
'致不灭的你 第二季' = '/home/trim21/downloads/bangumi/致不灭的你/s2/' # abs path may not work with web-ui
'致不灭的你 第三季' = './致不灭的你/s3/' # relative related to save_path

[codecov]

Codecov Report

Merging #419 (a822dc6) into master (1ec7a5d) will increase coverage by 40.15%.
The diff coverage is 38.09%.

@@             Coverage Diff             @@
##           master     #419       +/-   ##
===========================================
+ Coverage        0   40.15%   +40.15%     
===========================================
  Files           0       32       +32     
  Lines           0     2316     +2316     
===========================================
+ Hits            0      930      +930     
- Misses          0     1386     +1386     

Flag	Coverage Δ
app	∅ <ø> (?)
downloader	40.15% <38.09%> (?)
front	∅ <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
bgmi/lib/cli.py	17.07% <ø> (ø)
bgmi/script.py	38.19% <0.00%> (ø)
bgmi/utils/__init__.py	42.31% <22.22%> (ø)
bgmi/lib/download.py	35.89% <50.00%> (ø)
bgmi/config.py	90.62% <100.00%> (ø)

... and 27 files with indirect coverage changes

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