implented sliding
added slide attack damage
slide attack is now only available as a cheat
npc bounding box no longer detaches from player
fixes #1112
NPCs now can't escape their bounds
halved gay island
add platforms to chairs
Merge pull request #1174 from hawkthorne/studyroomchair

Jump on the furniture in the study room
renamed the halved gay islands
Merge pull request #1144 from NimbusBP1729/stationary_npc

npc bounding box no longer detaches from player
Merge pull request #1170 from didory123/gayisland_half

halved gay island
Merge branch 'master' into sliding

Conflicts:
	src/player.lua
Merge pull request #1009 from NimbusBP1729/sliding

Sssssliders (inspired by @vistascan)