Car stereos
Added stereos to item groups
Stereos need a cd to play
Fixed the wrong Id in item groups
Stereo saves
Add color support for messages

This commit contains some dummy message functions (_type).
They are intended to be removed in a later commit
Overload message functions

… and get rid of those ugly “_type” things
Overload player.cpp wrappers around add_msg
Ensure new game_messages have always a type.
Change enum game_message_type
Fixed melee.json spacing getting messed up
Put most game messages (add_msg …) into an appropriate category
Make new NPC wrapper functions around add_msg (with type)
Colorize melee battle messages
Colorize death and guilt messages
Colorize mutation messages
Colorize monster messages
Fix flipped message colors for mutation changes
better sounds for the sterep
Document “enum game_message_type” in ENUMS.md