Provide a pair of methods, setCurrentClient() and setCurrentDesktop(),
to allow effects to select items in the tabbox without activating them.
Insulate effects from having to know the order of desktops, with
currentDesktopList(). DesktopMode and DesktopListMode should be
effectively identical as far as how effects work.
Some changes to how the tabbox refcounting is done, should work a little
better. Other small cosmetic changes.
Update BoxSwitchEffect.
svn path=/branches/work/kwin_composite/; revision=647594
Also add SceneOpenGL::Texture class, based on GLTexture. Optimised for SceneOpenGL::Window, this adds support for loading from an X Pixmap, as well as taking advantage of texture_from_pixmap/shm when available. Automatically detects what texture target should be used, so be sure to enableUnnormalizedTexCoords() before painting.
Make SceneOpenGL::Window, BoxSwitchEffect, and ExplosionEffect use the new classes.
svn path=/branches/work/kwin_composite/; revision=645125
