fixed bug in vector layer visualization
pulled qps updates

startet implementatino of stackedbandinput dialog and required classes

fixed Temporal profile expression evaluation

improved speclib CSV export

pixelloader.py - loads from valid band-indices only
profilevisualization.py - refactoring, added exampleLyr(sensor)
   several changes related to 3D plotting: added ViewWidget3D(), TemporalProfile3DPlotStyle(PlotStyle), PlotSettingsModel3D(QAbstractTableModel)

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)

minor changes

changen MapViewUI layout form horizontal to vertical
added MapView specific crosshairs

added new Icons

toggle crosshair visibility for for all mapviews, selected mapviees, single map canvases