profilevisualization: date2num num2date now based on decimalyear values

profilevisualization.py refactoring, added TemporalProfile.plot()

refactoring PixelLoader. in case of image intersection, overlapping Geometry is truncated to image bounds

SEVERAL CHANGES TO TEMPORAL PROFILE VISUALIZATION
+ dynamic data loading
+ free choice of TemporalProfiles
+ removed dependency to in-memory QgsVectorLayer

updates to virtualrasters.py

https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Multiprocessing

fixed map rendering error: changes in mapview & sensor specific render settings will be applied also on non-visible QgsMapCanvases

utils.py refactoring (loadUi -> loadUI, affects many widget classes)

added cursorlocationvalue.py + panel
added spectrallibraries.py + panel
added a couple of new icons
added trees.py (basic TreeModel system)

TimeSeriesViewer inherits QgisInterface
refactoring maptools
 - added mapcanvas.MapTools
 - TimeSeriesviewer.onShowProfile handles location based maptool requests (CursorLocation, Temproal/spectral prpofiles)

fixed bug in mapvisualization.py

MapCanvas: used MapCanvasLayerModel that support lazy loading of QgsMapLayer instances
MapViews can have individual vector layer sources for overlay

minor changes

several updates to mapvisualization.py
cleanups + refactoring

fixed icon of mainwindow

mapvisualization: fixed several optical issues, connected buttons