Add sound support to mild.edc (which the black theme uses).

Signed-off-by: Chris Michael <devilhorns@comcast.net>
don't request ethumb again when it dies unless we have a queue
handle gif loop none and loop count 0 vs actual loop counts (or -1)
initialize ipc before shuting it down.
terminology: we did rename generic backend to vlc as it is its real name.
it's time to set TERM to xterm-256color
256: have a config to choose whether to set TERM to xterm-256color
add -2/--256color option to set TERM to xterm-256color

Man page was modified accordingly.
256: fix color cube