Added VertexArrayObject for Qt4
Drop Qt4 support
Update debian dependency
TODO update
Debian control update
Drop qjson dependency, use Qt5's own parser instead
Debug stats response
Merge branch 'develop' into ports/android

Conflicts:
	CMakeLists.txt
	source/glutils/glresourcemanager.cpp
	source/glutils/texture.h
	source/network/filedownloader.cpp
	source/storage/cachefile.cpp
	source/storage/filemanager.cpp
	source/ui/CMakeLists.txt
	source/ui/map/airportitem.h
	source/ui/map/modelmatcher.cpp