Implementing item pruning and UI tweaks

Item pruning is in this commit, and since I was working on items I
implemented the new UI for inventory. Looks great - there's still some
tweaking to do but this is pretty significant progress.

Need to add the no-prune toggle to the map editor. Will do that
separately.
Merge remote-tracking branch 'origin/master' into features/item-pruning

Conflicts:
	Assets/Assets/Libraries/RushForward.Legende.Common.dll
	Assets/Assets/Libraries/RushForward.Legende.Server.TNet.Common.dll
	Legende.userprefs
	RushForward.Legende.v12.suo
Minor fixes post-merge

Just fixing up a few things that broke with the merge.
Merge pull request #10 from Rush-Forward/features/item-pruning

Implementing item pruning and UI tweaks