Fix initialization of optimization_distance.
Keep only one constructor of MapEntity.
Make MapEntity::suspended and when_suspended private.
Replace sol.audio.play_music("none") by sol.audio.play_music(nil).
Inline geometry functions.
Merge branch 'master' into texture
Replace some lists by vectors in MapEntity.
Merge branch 'texture' of github.com:christopho/solarus into texture
Remove trailing whitespaces.