Restructuring of code to enable adding items to inventory one by one.
UI fixed for the most part, minus a few bugs.
Merge branch 'master' of https://github.com/RobbSteel/Lords-of-Distortion

Conflicts:
	Lords-of-Distortion/Assets/Scenes/MainMenu.unity
	Lords-of-Distortion/Assets/Scenes/StageOne.unity
	Lords-of-Distortion/Assets/Scripts/MenuScripts/PlacementUI.cs