Beta 1.7

• Implemented some BitStream functions
• Implemented PathedInterior::doSustainSound
• Some work on compiling with Clang (thanks HiGuy)
• Preview Objects now all within SimSet
• Ability to check if an object is meant for preview mode from script
• Refactored RenderInstance Managers
• Refactored some general render code
• Cleaned up some hifi code

• Fixed Marble Sound Pitch Issue (thanks thearst3rd)
• Fixed Editor Axis Handles
• Fixed some rendering issues
• Fixed dark astrolabe and clouds
• Fixed a hifi issue