refactoring

cleanup, refactoring,smaller fixes

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

added logging
added fileSizeString(num)
added SpatialPoint(QgsPoint)
added filterSubLayers(filePaths, subLayerEndings) and getSubLayerEndings(files)

make::createFilePackage
auto-generated test file package __init___.py

fixed AboutDialogUI call

refactoring
navigation to TimeSeriesDate of interest

PixelLoadWorker always returns 3D stack

introduced SensorTableModel to show sensors in QTableView
introduced TsvMimeDataUtils to extract information from QMimeData objects
renamed MapViewManager to SpatialTemporalVisualization
introduced TimeSeriesDatumView -> represents a column in SpatialTemporalVisualization
introduced TimeSeriesDateViewCollection
introduced MapViewCollection
TimeSeriesTableModel: sorting, some helper functions
MapView: sigSensorRendererChanged, MapView.sigSpatialExtentChanged

added activateMapTool(mapToolKey)  to TimeSeriesDatumViewManager and TimeSeriesDatumView

refactoring (a lot), minor cosmetics

minor UI changes

action based event handling

simplified labeling: uses now mouse buttons to add / remove observation dates from the date collection

recognizes observation date from Landsat scene ID in file names