Default style (i.e. QML file sidecar file) not loaded when dropping a raster into a MapView

[Andreas Janz]

example file here: "\\141.20.140.91\san_gs2_EnMAP\temp\temp_bj\fromAR\LC8_20180723_193023.tif"

[Benjamin Jakimow]

Mhhh. This is in conflict with #166

[Benjamin Jakimow]

test_mimedata.py drop tests: removes added dock / data sources layerproperties.py - defaultRasterRenderer - added readQml:bool=True to read default renderer from qml file, if defined - closes #338 (might be required to enhance to other style uri types)

Signed-off-by: Benjamin Jakimow [e-mail] [e-mail]

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