DebugAPI: New core API that will provide similar functionality than DebugStatsModule. Updated basic profilee UI to be easier to read. Removed unneccesary stuff and starter to implement 'tundra' style in DefaultStyle.xml. Minor simplifications to UI.png. DebugHud copied from urho and extended for Tundra use. Will finalize so that 3rd party code can add their own 'tabs'.