Nyall Dawson 70c1680754 Automatically handle adding data defined button for dynamic properties
Also exposes this capability to modeler - so that model algorithms
can use data defined parameters within their child algorithms.

TODO:
- tests
- setting the associated vector layer
2018-09-04 19:06:07 +10:00
..
2018-08-16 19:12:53 +10:00