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[ADD #176] - the network editor now also accepts drops properly and forwards the handling of these events to the main window.

[ADD] Add WItemSelectionItemTyped which can stored a value. Modify  WItemSelectionItem and WItemSelection to add and cast to new type.

[FIX]  - when qt webkit was not installed, this caused an error since the m_frame member was not defined there. This is fixed.

also moved some properties to a property group

[FIX] - isnan and isinf renamed. Boost provides makros with these names on _some_ architectures which leads to a name conflict.