Nyall Dawson dca697b427 [processing] New c++ QgsProcessingRegistry class
Intended as a registry for the various processing components,
including providers, algorithms and various parameters and outputs.

Currently handles only registration of providers, as a step toward
removing processing's algList (this requires first porting
the algorithm class to c++)

A QgsProcessingRegistry instance is attached to QgsApplication,
and is retrieved by QgsApplication::processingRegistry()
2017-01-11 10:55:15 +10:00
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