rename MPEG2Video into MPEG1Video, MPEG2Audio into MPEG1Audio

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #345 (e9c2a85) into main (4e789ff) will increase coverage by 0.01%.
The diff coverage is 84.37%.

@@            Coverage Diff             @@
##             main     #345      +/-   ##
==========================================
+ Coverage   83.05%   83.07%   +0.01%     
==========================================
  Files         101      101              
  Lines       10380    10380              
==========================================
+ Hits         8621     8623       +2     
+ Misses       1384     1382       -2     
  Partials      375      375              

Files Changed	Coverage Δ
pkg/formats/rtpmpeg1audio/decoder.go	96.20% <ø> (ø)
pkg/formats/rtpmpeg1audio/encoder.go	78.67% <ø> (ø)
pkg/formats/mpeg1_audio.go	63.15% <78.57%> (ø)
pkg/formats/mpeg1_video.go	87.50% <87.50%> (ø)
pkg/formats/format.go	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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