Add 16-bit support to QImage via python and the UI

[qgib]

Author Name: Carl Gnarly (Carl Gnarly)
Original Redmine Issue: 16840

Redmine category:unknown

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16-bit support would be useful to be able to use height-map images in other applications outside of just printing maps. displacement in CG or simulation applications for instance. 8-bit images don't offer nearly enough dynamic range to be able to be further utilized outside basic illustrations or printing.

Currently it is impossible to render and export 16-bit images from Qgis without using the gdal library which makes other Qgis functionality useless. Scripts that export using Qgis libraries have to be rewritten when exporting with gdal, which forces the user to do more than double the work (not considering the research of a whole other library).

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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• assigned_to_id removed Victor Olaya
• category_id removed Processing/QGIS

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Unknown