Fix y-axis in MapRenderer
Added Spatial library
Using Spatial library in MapScene instead of linear lookups
Using Client::invalid() signal instead of QObject::destroyed()
TODO Draw item lines
Remove CONFIG_NO_VBO
Merge branch 'misc/qt5' into ports/android

Conflicts:
	source/CMakeLists.txt
	source/ui/map/airportitem.cpp
	source/ui/map/approachcircleitem.cpp
	source/ui/map/maprenderer.cpp
	source/ui/map/maprenderer.h
	source/ui/map/mapscene.cpp
	source/ui/widgets/mapwidget.cpp