Add Slide Show to View menu and toolbar: - uses own slideshow implementation (same as Showfoto/Image Editor) - implemented with preview, so can be also used as full screen preview - left KIPI-plugin in Tools menu (should be renamed to reduce confusion)

TODO: find good keyboard shortcut to assign to Slide Show function

• all obvious ones are already used: F5 (powerpoint), F12 (kpresenter)

CCBUG: 135655
BUG: 140303, 140304

svn path=/trunk/extragear/graphics/digikam/; revision=632071