overhaul Image Statistics app; rename it to Band statistics

The Image Statistics app could need an overhaul.

make it interactive: allow stats for the current canvas extent
allow individual bands instead of always calculating band stats for all bands
use QgsRasterInterface::bandStatistics(bandNo, stats, extent, sampleSize) for calculations

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Also connect the app the the DataSources raster layer and band context menu, to allow for quick stats

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