Fix CC3PODCamera orientation during animation.

Fix CC3PODCamera orientation during animation. Clear scaling animation during
CC3PODCamera loading. Add camera backpointer to CC3Frustum to access view matrix.
Remove precompiled headers from demo and template projects.
Make bounding volumes optional.

Fix issue where CC3Billboards not assigned shaders during node picking. Bounding
volumes no longer required or created automatically. Add CC3Node createBoundingVolumes
and deleteBoundingVolumes methods to manage bounding volumes within a node assembly.
CC3Mesh defaultBoundingVolume property deprecated and moved to CC3MeshNode.
Don't change cam dims from surface if they're zero. Camera frustum, separate marking
proj dirty from marking frustum planes dirty. Remove extraneous local var in macro
not used in Release builds.