mpeg: Drop unused parameters from ff_draw_horiz_band()
avformat: utils: Refactor duplicated PRINT macro
ac3dec: Allow asymmetric application of DRC when drc_scale > 1

Amplification of quiet sounds is enhanced.
Inspired by gbooker's A52Decoder.
doc: add decoders.texi

Only documents ac3 decoder options at this point.
doc: document correct option to list encoders
dynamic loading of shared faac library
no Werror on implicit-function-declaration and missing-prototypes
custom icon and windows resource
use upstream version tag, my repo is always rebased