This introduces "Streamer Mode" to mosaic specified NSFW images, making
the game suitable for streaming or public viewing. This feature is
enabled via the '-censor <file>' command-line option, which takes a file
containing a list of image numbers to be filtered.
System3.x uses the following bit expansion when converting RGB565 to
RGB888:
RRRRR GGGGGG BBBBB => RRRRRRRR GGGGGGGG BBBBBBBB
12345 123456 12345 12345123 12345612 12345123
However, SDL's blit functions use a slightly different mapping, so
sometimes expanded color did not match the color key specified in the CX
command.
To avoid this, convert to RGB888 by ourselves when drawing 16-bit CGs.
Before this, cg_load() skipped loading CG or loaded only palettes,
depending on the flags set by the PC command.
After this, it always loads a CG and populates the cache. Functions for
loading only palettes have been removed. Actually this may be good for
performance, because some games use `PC 0:` to prewarm the cache.
kichikuou