procedural linear generation of spaces for level

Conflicts:
	source/Level.hx
	source/PlayState.hx
spaces have eventual neighbors introduced
quatrominos
repaired conflicts
for rebase

Conflicts:
	source/Level.hx
added a ref to level in space
next room set / 1 door max per room face
1st room to the right
load maps with masks
undoubled the door touch

Conflicts:
	Assets/data/levels/room_0111.tmx
	Assets/data/levels/room_1011.tmx
	Assets/data/levels/room_1101.tmx
	Assets/data/levels/room_1110.tmx
plugged cave generation w/ levels
Merge branch 'cave_generation'

Conflicts:
	Assets/data/levels/room_1111.tmx
	LD29.hxproj
	source/Door.hx
	source/PlayState.hx
resolved conflict ("top" & "up")
Merge remote-tracking branch 'remotes/origin/master'