Reduced the usage of g_configuration and renamed DisplayGroupManager to DisplayGroup.

Change-Id: Ic4d35e3ac72c046b54023fe038d61c42c26696d0
Renamed ContentWindowManager to ContentWindow.

Change-Id: Ibd49623fb9b8659f46adcabbc0ffe487b77fca49
New Webbrowser Widget in the Main UI.

Change-Id: I40a34a39e8350f3ecf05bd8511039c70fd0a8334
Merge pull request #110 from rdumusc/renaming

Friday refactorings. Added an option to choose the Webbrowser size.