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)

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

fixed Temporal profile expression evaluation

added SpectralLibraryTableFilterModel

SpectralProfile inherits QgsFeature
SpectraLibrary inherits QgsVectorLayer

improved rendering dialog (WIP)

profile visualization: fixed TP loading status, added TP ContextMenu

fixed Issue #42

refactoring