Bugfixes to graphics cases in ServerWindow
Added assignment operator to GraphicsBuffer
Style fixes for ServerCursor and ServerBitmap
Implemented and integrated CursorHandler to clean up DisplayDriver code some
Hotspot bugfix for ServerCursor(cursordata *)
git-svn-id: file:///srv/svn/repos/haiku/trunk/current@9019 a95241bf-73f2-0310-859d-f6bbb57e9c96
