NEVERHOOD: Remove or silence by default some more debug output
NEVERHOOD: Stop all sounds before restoring / restarting

This fixes the static heard when loading a saved game to a scene with
music, when the current scene also has music
NEVERHOOD: Move some more cheat code to the cheat console command
NEVERHOOD: Fix a slight glitch with the symbols cheat command

Now, the countdown to show the next symbol is properly reset when the
command is used
NEVERHOOD: Hook the dump vars debug code into a command, "dumpvars"

Also, did some minor cleanup of the console commands
(alphabetical reordering)