Added a powerRotate class to add to powers that have rotation options

Updated PlacementUI to add the powerRotate as a component when needed and destroy it.
Merge branch 'ui-revamp' of https://github.com/RobbSteel/Lords-of-Distortion into ui-revamp
NGUI Script had an error - Updated the fix for it.

Created PlacementRoot prefab -- the UI for placing powers
Can place powers using the new UI.
Commented out most of the LordsSpawnManager code inside the ArenaManager.

Can place powers. At the end of the 15 seconds, the UI does not tween away, but it may have to do with the foreach loop in the Update function of ArenaManager that calls lordsSpawnManager to add power spawns.