The following things still need to be changed:
* don't use virtual method in Window
    * Use a WinBits flag for it
* move all the dialogs to it
* fix the ugly hack for range name dlg
* fix all the uncommented code in winproc.cxx
* general clean-up

Change-Id: I2a8cfc1c4abf591878b11aa4829a9ff910540eff