Sculpt paint tools now pop up an error message if
dynamic topology or multires are enabled.
Implementation notes:
* SCULPT_vertex_colors_poll is now a static function in sculpt_ops.c.
It is now used solely by the legacy color attribute conversion
operators (SCULPT_OT_vertex_to_loop_colors and SCULPT_OT_loop_to_vertex_colors)
and should be deleted when they are.
* There is a new method, SCULPT_handles_colors_report, that returns true if
the sculpt session can handle color attributes; otherwise it returns false
and displays an error message to the user.
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