Nyall Dawson e304662a4f Use standard QgsUnitTypes::RenderUnit throughout labeling
Instead of duplicate labeling specific unit enum, reuse
the QgsUnitTypes::RenderUnit enum in labeling.

This brings several improvements, including:
- label offset/distance/repeat units now works correctly
in all available unit types (inc pixels, map unit meters,
points, inches, etc)
- less duplicate code
- labeling can use the robust QgsRenderContext methods for
converting between different units and painter coordinates

Also change comments for members to doxygen comments, so
that these get included in the API docs.
2017-07-24 11:18:30 +10:00
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