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

several updates to mapvisualization.py
cleanups + refactoring

changen MapViewUI layout form horizontal to vertical
added MapView specific crosshairs

refactoring

added # -*- coding: uft-8 -*-   and  # noinspection PyPep8Naming to each module
added GPL License statement to each module
added from __future__ import absolute_import to each module

SensorPlotStyle get restored
PixelLoader.py: CRS transformation in pure GDAL due to problems with QgsCoordinateTransformation in non-main thread
utils.geo2px() now casts geo2pxF coordinates to integer (instead of rounding them)

changed test sets
added timeseriesviewer/i18n folder (from PluginBuilder)

added sigShowVectorOverlay and sigRemoveVectorOverlay

MapCanvases get registered at responsible Controllers (STV, MV and DV)
utils.saveTransform(geom, crs1, crs2) takes care on invalid coordinate transformations

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

class ImageDateParser to be inherited by data-set specific date-time-group parsers
class ImageDataParserLandsat(ImageDateParser) to extract date-time-groups from Landsat like data-sets (SceneID / ProductID)