Provide the dolphinpart view modes (Icons, Details, Columns) in konqueror's View...

Provide the dolphinpart view modes (Icons, Details, Columns) in konqueror's View Modes menu.
(this is done using a Q_PROPERTY in the dolphin part and a signal; the available view modes for creating the menu in the first place are listed in dolphinpart.desktop)
Konqueror: cleaned up the old (complex) handling of view modes as N toolbar buttons from M services grouped by library (240 lines less!).
Dolphin: moved view mode handling to DolphinViewActionHandler, removes duplication between part and mainwindow.

svn path=/trunk/KDE/kdebase/apps/; revision=774646