Added #13 Mouse now snaps to room walls when creating rooms
Fixed #20 internal volume holes not working
Fixed #8 Unity editor Undo/Redo for BuildR editing. Normal control-z undo is supported throughout the BuildR editor
Fixed #9 LOD facade calculation issue where wallsection spacing was calculated incorrectly producing different sized wall sections depending on which LOD level was used
Fixed #15 incorrect calculation of normals on curved facades without a facade design applied Fixed #4 horizontal position of internal wallsection walls generation
Fixed #18 issue with loss of selected floor when creating a new room and clicking outside the selected volume