Cache global matrix

[Benualdo]

Must be computed at init, when moving, editing etc... but not every frame.
A "Dirty" mecanism is needed, maybe could dynamic objects could also benefit from it.

Is invalidate on Instance::setLocalMatrix + OnLoad / OnStart calls enough?

Only for static elements?

Check cache in Instance update and init methods and only "Dirty" in setLocalMatrix calls?

[Benualdo]

(getGlobalMatrix is ~1ms per frame on my Surface Pro ARM in Development mode)