Add layer system (like states). Add more button/enemy functions. Overhaul HUD.
Merge branch 'master' of https://github.com/nczempin/Turris-Monacoae

Conflicts:
	game.lua
	gameoverlayer.lua
	hudLayer.lua
	libraries/button.lua
	libraries/gui.lua
	main.lua
Merge branch 'master' of https://github.com/nczempin/Turris-Monacoae

Conflicts:
	game.lua
	main.lua