Physics and Restructuring

Trying to abstract world creation but failing. I want a nested
parent-child relationship so we can start making the rest of the solar
system.

Also need to get a decent reference frame conversion system that
ultimately spills back to "stationary" cartesian reference frame with
system barycenter at origin (0,0,0).

Only then can the camera controls be truly perfected and made to sync to
any planet orbit with additive rotate controls.