avoids QgsMapCanvas() calls without any parent = None, which caused crashes on macOS

fixed import of ENVI spectral libraries

main.py vector layers are added to QgsProject.instance() map layer store (that we can still use the QgsMapLayerComboBox)
__init__.py removed dummy statememnt from __version__
removed Qt. calls

refactoring
added timeseriesviewertesting and moved tests to

Crosshairs: refactoring, unified per mapview, position remains on position of last mouse-click (closes issue #12)

added TimeSeriesViewer.mapLayerStore()->QgsMapLayerStore()

timeseriesviewer/__init__.py: loads QGIS resources on start (for dev environments), added workaround for PyQtGraph issue 774,
timeseriesviewer/__main__.py refactored

mapvisualization.py fixed renderer export

added resourcemockup.py

utils.py improved qgis app initialization, added QgsPythonRunner implementation (for testing)

metadata.txt, pb_tool.cfg, make/deploy.py: refactoring, qgis min/max version by QGIS_MIN / QGIS_MAX

fixed DTG parsing from ENVI header
recognizes YYYY as date

stacked image import preserves ColorTable and CategoryNames information (from first input stack band)

mapvisualization.py renderToXml now uses in-memory VRT as dummy VRT

utils.py createQgsField extended to other types of numpy floats
timeseries.py fixed verifyInputImage

startet implementatino of stackedbandinput dialog and required classes