Add cpm-var-buffer to help manage VBOs and IBOs.

Looking into using unique_ptr and std::move to ensure that memory gets
freed when the VBOs and IBOs are transfered to the graphics card.
Comment out reference code.

Code will be removed once I have a more fully functional renderer based
off of old scirun4.
Replace std::vector with var-buffer.
Fleshed out implementation of node traversal.