v8.3 Preview

*Added many new biomes from Felger (Luna, Mars/Deimos/Phobos, Venus, Jupiter and its moons, Saturn, Uranus
*Includes DDSLoader from Sarbian, and full DDS support.
*Allows specifying textures via GameDatabase rather than via direct loading (remove GameData/ prefix and remove extension, and make sure the image you are referencing is not under a PluginData folder)
*Update loading to include AppRoot when loading locally (thanks TriggerAu)
*Log on not finding LaunchSites.
*Add support for VertexPlanet and for useHeightMap in LandClass (thanks Starwaster)
*Support more light-shifting (can now modify Sun.AU and Sun.brightnessCurve)