v0.3 Update

New features:

• Moved most visualization code to shaders to allow reuse and faster development of new visualizations
• Added 2 new interactive visualizations - Bar Graph and Puddle
• Added controls - VR controllers should show up in game as a generic floating capsule
• Added ability to move and rotate interactive objects
• Added spawn menu to add and remove objects
• Cleaned up Atom visualization to reduce flashing and fix z fighting