StatsPurveyor cleanup
Automatic translations update from Transifex
https://www.transifex.com/projects/p/vatsinator/
UI fixes
Merge branch 'develop' of https://github.com/Vatsinator/Vatsinator into develop
Merge branch 'develop' into misc/qt5

Conflicts:
	source/network/statspurveyor.cpp
Removed VertexBufferObject
Replaced with QOpenGLBuffer and QOpenGLVertexArrayObject
Using shaders
Added identity.frag and identity.vert shaders
Using QOpenGLTexture
Added textured shader
Add support for Airports
Unmake UserInterface class a singleton
Prepare UserInterface to go abstract
Buffers' fixes
Migrate Airports to QOpenGLTextures
Merge branch 'misc/opengl-upgrade' into misc/abstract-user-interface
Added IconKeeper class
Add support for FlightItems
Merge branch 'misc/opengl-upgrade' into misc/abstract-user-interface
Fix include
Make SettingsManager independent from ui
Shader fix
Merge branch 'misc/opengl-upgrade' into misc/abstract-user-interface
Make UserInterface abstract