[Cin] flac 1.4.0

[Andrea paz]

I added wav-type sources on top of the previous mp3-type sources to
make the project a little bigger.
Tests confirm that 'compression 5' is more efficient than 'compression
0'. I do not understand why. Phyllis' results seem more logical to me.

I also add the results obtained using the flac preset of ffmpeg always
at compression 0; 5 and 8. The fps are comparable but not the size
(due to optimization patches?).

Flac:
** rendered 26152 frames in 2.886 secs, 9061.677 fps, size 63.2 MiB

** rendered 26152 frames in 1.637 secs, 15975.565 fps, size 57.8 MiB

** rendered 26152 frames in 3.368 secs, 7764.846 fps, size 56.8 MiB


ffmpeg flac:
** rendered 26152 frames in 3.102 secs, 8430.690 fps, size 138.4 MiB

** rendered 26152 frames in 1.649 secs, 15859.309 fps, size 127.8 MiB

** rendered 26152 frames in 2.937 secs, 8904.324 fps, size 126.4 MiB


Flac 1.3 (appimage):
** rendered 26152 frames in 1.445 secs, 18098.270 fps, 63.4 MiB**