- move Shadow configuration UI to libs
- removed useDropShadow and useOxygenShadow options, and replaced by activeShadow::enable and inactiveShadow::enable
- use kcfg for decoration configuration. The handling of exceptions requires dedicated readConfig and writeConfig methods, implemented in oxygenutils
- changed sizegrip combobox into a check box and rephrased for clarification
Oxygen::ShadowCache::shadowSize() now returns the shadow extend outside of the window body (the extend)
Overlab between the actual shadow pixmap and the window body is dealt with internally (by creating larger pixmaps)
This allows notably Oxygen::Client to not attempt to draw shadow when shadowSize == 0 (which was never the case
before)
The flag has been made obsolete by the fact that window corners are not part of the shadow anymore.
Configuration::useOxygenShadows is now dealt with by setting the active flag directly.
