For now the equalizer shade mode is without any function, only the background
image is displayed.
This change disables skins that have no eq_ex bitmap.
Now Skin no longer is a singleton class.
In the long run, Skin will only hold information about a skin, while
SkinManager will be responsible for loading skins and notifying the windows
of the change
It's now no longer necessary to restart promoe for new settings to take effect.
The Signal is piped through Application.
Updated the classes that are affected by settings changes
Removed some now unused code from XMMSHandler
Moved positions and sizes of close and shade buttons to Skin
changed buttons to use PixmapButton
moved buttons from PlaylistWindow to PlaylistWidget and PlaylistShade
removed now unused Button
fixed position of shadebutton (was off by 1)
fixed icon of shade button in shaded mode