[KPhotoAlbum] Color scheme support

[Johannes Zarl-Zierl]

Hi,

I've just merged a branch to improve the support for color schemes:

* KPhotoAlbum no longer uses hard-coded colors for any decorative role.
I.e. the only places where explicit colors are used are to convey a meaning 
like red/yellow/green colors in the job status led.
This means that KPhotoAlbum now looks nicer with dark color schemes.

* Custom color schemes are now supported: you can select a different color 
scheme than your system scheme view "Settings | Color Scheme".
For anyone using e.g. KDEnlive, this will be quite familiar.

* Background colors:
Instead of the custom background color that one could alter in the Thumbnail 
settings, KPhotoAlbum now uses the "Alternate" color set from the active color 
scheme.
This means that if you want to change your color it is slightly more work: You 
have to change the color in the "Choose color scheme" system settings module.

In addition to the thumbnail view, this background color is now also used for 
the viewer window.

Please try this out and maybe play around with color schemes - I'd be happy 
for any feedback regarding this change!

Cheers,
  Johannes
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