Add new NotifyObject functor and use it in TransformObjectsCommand.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Add some minor fixes to SplitterWindow.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Merge branch 'NewArchitecture' of github.com:kduske/TrenchBroom into NewArchitecture

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

Conflicts:
	common/src/View/SplitterWindow.cpp