Nyall Dawson d84b70f04d [processing] Add acceptable string values to parameter metadata
Returns a descriptive list of the possible string values acceptable
for the parameter.

E.g. for a QgsProcessingParameterVectorLayer this may include
"Path to a vector layer", for QgsProcessingParameterBoolean
"1 for true, 0 for false" etc.
2019-03-04 07:57:24 +10:00
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