v0.71.473

Changelog since last release:

• added texture streaming system: DDS texture files will be using streaming
• reduced resource loading times
• terrain virtual texture improvements: better caching, reduced texture pop-in
• added background image scaling modes for loading screen
• editor:
  • new redesigned GUI
  • paint tool brush size can be modified by scrolling mouse wheel
  • general options: DDS convert button to convert every texture in the scene to DDS