Make setComponentCursor() virtual so it can be overridden in subclasses to set cursors for individual native widgets in a composite component (only the rendercanvas of viewers, for instance).
Make setComponentCursor() virtual so it can be overridden in subclasses
to set cursors for individual native widgets in a composite component
(only the rendercanvas of viewers, for instance).

Removes getComponentCursor(), as it simplifies the interface to not
store the current cursor setting.

Alexpux/SoXt,Alexpux/SoXt,Alexpux/SoXt,Alexpux/SoXt