Reworked the channeloverview window in config-ui.xml.

modified:   config-ui.xml
new file:   images/channeloverview_icon.png
Reworked the iconimport window in config-ui.xml.
Added the channeloverview_icon_mask.png for the channeloverview window in config-ui.xml.
Removed no longer needed comments in the searchview window in music-ui.xml.

modified:   config-ui.xml
new file:   images/masks/channeloverview_icon_mask.png
modified:   music-ui.xml
Tweaked the arrows background placement in window channeloverview do to scaling errors.

modified:   config-ui.xml