Add constness to HeroSprites.
Add constness to DialogBox and Game.
Fix teletransporter constness.
Move snes_spc source files to the new third_party directory.
This ugly pimple is actually no longer necessary.
Rename Main.cpp to Main.cpp for consistency.
Make hero state fields private.
Rename RandomMovement::get_max_distance() due to parent class conflict.
Add constness to MapEntities.
Move MapEntities::get_ground() to Map::get_ground().
Remove non-const version of MapEntities::get_separators().
Fix a duplicate lookup.
Add constness to InputEvent.
Reindent.
Fix doc typos.
Reindent.
Reindent.
Call enemy:on_dead() when falling into hole, lava or water (fix #350).
Add an event sensor:on_left() (fix #339).
Add constness to Hero::State start/stop functions (fix #352).