Add View-Factory
Take advantage of WindowState
Use MultiBar instead of Tabs...

A little bit amazing: I didn't even realize at first that I changed back
to using "Tab"-Containers instead of "MultiBar"-Containers. I was simply
missing the tool bar integration.

Well, then i saw that little thingie in the top left corner (color
gradient was wrong), when it suddenly came to mind: I wrote about 2,5k
lines of code to fix that one :-)
Add comments
Add a config saving interface.

Not sure yet if this will survive in this way.
Actually remove a widget in take()
Teach Heaven::Mode to reapply it self and to reset itself
Maintain a relation between current wsView and View
Revert most of the previous commit and generalize it
Config saving
Don't look to deep into config files
Invoke updateConfig()
Remove Decorator class
Cleanup
Simplify TLW
Manage root container from within HeavenWindow

- Teach HeavenWindow to internally manage the root container
- Teach PrimaryWindow(Layout) to grab the root widget directly from the
  container
- Teach SecondaryWindow to setup a root container and to lay it out all
  over its space.
Make tester compile again
Remove unused variable
Simplify ViewContainer
Move Mode from Views/ to App/