Zheng, Lei bc26820837 Gui: Placement/DatumCS view provider changes ...

* Add always zoom invariant and always on top rendering to
  ViewProviderDatumCS

* Add a new utility class AxisOrigin for more efficient axis rendering.
  Also exposed to python.

* Change ViewProviderPlacement to use AxisOrigin for rendering.
  A single instance of AxisOrigin is shared by all
  ViewProviderPlacement. Selection context is used to distinguish among
  different instances.

2019-08-17 15:08:34 +02:00

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