removed test printouts
test prints when context managers quit
rough in of controls editor and panel support
Merge branch 'master' of https://github.com/theodox/mGui

Conflicts:
	mGui/core/__init__.py
TabLayout automatically uses the key values of it's children to name tabs
explicitly force getters to win over setters
added 'backgroundColor' flag to layouts
fixed subtle bug in layout nesting where some classes were not using the global ACTIVE_LAYOUT registry