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Remove layer extent and statistic variables from processing contexts
These variables take a lot of time to calculate and cause lots of lengthy hangs in processing. (Eg add some moderately large rasters to a project, then try to run any processing algorithm and QGIS will freeze). The layer extent can already be used in expressions via the layer_property function, which only evalutes the extent if required and only for layers it is used for. The band stats for raster layers should be moved to a band_statistic function in core which behaves the same way.
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