r.what.color
Queries colors for a raster map layer. 
Raster (r.*)
QgsProcessingParameterRasterLayer|input|Raster map to query colors|None|False
QgsProcessingParameterString|value|Values to query colors for (comma separated list)|None|False|True
QgsProcessingParameterString|format|Output format (printf-style)|%d:%d:%d|False|True
QgsProcessingParameterFileDestination|output|Colors file|Txt files (*.txt)|None|False
