Added pause menu, fixed some GUI stuff.
Meta files
Merge branch 'Niels' into develop

Conflicts:
	Assets/Materials.meta
	Assets/Models/Tower&TrapsModels/WallTower_final.fbm.meta
	Assets/Models/Tower&TrapsModels/WallTower_final2.fbm.meta
	Assets/Prefabs/Canvases/Canvas.prefab
	Assets/Prefabs/GUI/GUI Main.prefab