DONE - Refactor string parsing and chat dumping to use MD_String8
DONE - Delete old perception types and sources, like from an enemy or player item changed
 - Refactor perceptions to come from multiple places and format correctly
 - Perceptions happen in physical space, propagate in physical space.
 - Add two more characters, and 4 more items. Make the drama in the town better
 - Make eavesdropping happen much more "correctly"; draw correctly in party viewing
 - Talk to party button
 - Move tuning from makeprompt.h into tuning.h