There was some problems with restore, hide, clean and save background of item parts,
seen in detailsline. kill() worked not really clean.
kill() works now as virtual member and uses paintBackgroundBoxRel().
In consequence of which:
-unnecessary members in subclasses removed.
-add some comments
CProgressbar moved into components sub directory and adapt includes.
Progressbar objects are now usable as cc-item
TODO:
-some color and size corrections
-found some dub codes for sig and snr-bars, needs rework
It's easier to work with smaller files.
Most files contain only one cc-class and their names are
derived on the particular class that is contained therein.
