Keep only one class for toolbox color controls

instead of 5 (mostly identical) classes.

Also the following bugs were fixed:

* All pickers now use split buttons. (fdo#45671)
* Color palette now indicates the current color. (fdo#73891)
(Previous changes related to that bug are reverted as part
of this commit.)
* Selecting a color from a float panel now updates the
button. (fdo#77683)
* For Font color/background color in Writer, the color
that is shown on the button, is always the one that's
actually used. (Can be a different color after hiding
the toolbar.)
* For Font color/background color in Writer, the button
now indicates when we're in the format paintbrush mode.
(Removed in 085e8a07e61ef2d3a82e11094d8773ab17cfdb3c
for some reason.)

Change-Id: Idb4829552240c52fb0882aca627c8177bbe2f839

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