sw: add ThemeColorChanger that sweeps the model and changes colors

The ThemeColorChanger responisiblity is to recalculate and change
all the theme colors in the model. This includes styles and direct
formatting changes. It uses ModelTraverser for direct formatting
changes as it already implements traversing through nodes.

The ThemeColorChanger replaces the code to change the colors in
ThemePanel.

Also modify undo/redo for changing of attributes to not move
the cursor and selection when undoing and redoing (new flag
NO_CURSOR_CHANGE), as in this case it is very distrcting.

Change-Id: Ida1912bd0697307daad9244d474862830ab2686f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/145263
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

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