Renamed some files.

mainWindow->diagramMainWindow, formsegmentator->formSegmentator, mixedgesturesmanager-
>mixedGesturesManager, nearestposgridgesturesmanager-
>nearestPosGridGesturesManager, rectanglegesturemanager-
>rectangleGesturesManager, simpleforminitializer->simpleFormInitializer
renamed some files.

added deleted files