imageMath mission projection

[Benjamin Jakimow]

ImageMath fails to copy spatial extents from reference layer:

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Traceback (most recent call last):
  File "D:\Repositories\enmap-box\enmapbox\coreapps\enmapboxapplications\imagemathapp\core.py", line 641, in setValueByLayer
    extent = hubdc.core.Extent(xmin=qgsExtent.xMinimum(),
TypeError: __init__() missing 1 required positional argument: 'projection'

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[Andreas Janz]

resolves #509

→ <<cset 17e77b5adefe>>