Clarify message to the player when target isn't found.
Make chat symbol constants global.
Hack in use for none 'returntype' command targeting.  Most of this is a waste and pointless.  Since it's just duplicating work for nearly 0 gain.
Rework chat commands to load things via dofile rather than runfile.  This eliminates all the annoying scoping/environment issues with no loss.
Merge branch 'feature/chat_cleanup' into develop