Only try to parse clipboard contents when pasting.
Give some information about what has been pasted in the console.
Don't crash when loading a map file with an invalid brush.
Merge branch 'Release_1.0.0'

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

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