Snap vertices if their distance to integer coordinates is <= 0.2
Don't record changes in the MRU texture in undo system.
Properly update texture usage counts when undoing a brush creation.
Merge branch 'Release_1.0.0'

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>

Conflicts:
	Mac/TrenchBroom/TrenchBroom-Info.plist
	Windows/TrenchBroom/BuildNo