Add a static member variable to ShaderToy class to hold shaders directory.
Refer to the new static variable in RiftAppSkeleton to discover shadertoys.
Add tweakbar controls for head position, making m_chassisPos public for access by AntTweakbar.
Add a directory traversal function to delve one level deeper into the shaders/ directory during shadertoy discovery.
Fix some "might be uninitialized" warnings for four shadertoys.
Move headPos for angels back 10 meters so the viewpoint doesn't end up within the angel itself.
Add 3 excellent new shadertoys from ShaderToy.com's latest crop.