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

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

wip temporal profile saving

fixed Temporal profile expression evaluation

TemporalProfileCollection is now an in-memory TemporalProfileLayer(QgsVectorLayer)
added TemporalProfileTableModel, TemporalProfileTableFilterModel, TemporalProfileFeatureSelectionManager, TemporalProfileTableView

added default spectrum for spectral libraries

improved speclib CSV export

Speclib MIMEDATA Handling

added ClipboardIO(AbstractSpectralLibraryIO) to write/read Speclibs from Clipboard

added SpectralLibraryTableFilterModel

SpectralProfile inherits QgsFeature
SpectraLibrary inherits QgsVectorLayer