explain where find the models.
handle Nx1 vectors with N > 3
inject the matrix module into the global namespace
simplify the requiring
optimization: matrix/vector multiplication in 4D

introduce a fully-unrolled JIT friendly almost-cheating function
which takes a regular 4x4 matrix and a plain 4 (or greater) element
array and efficiently multiplies them, yielding a new plain table

then replace the pair of matrix.mul() calls in camera:position
with two calls to the new function. Repack the table in a matrix
only at the end of the calculation.

Speed gain:
x-wing: ~16 -> ~38 fps
dragon: ~2 -> ~5 fps
statue: ~1.5 -> ~3.33 fps
torus: ~41 -> ~68 fps

pending: document the now-cryptic code.
Merge branch 'master' of github.com:mojaves/LEon3D

(why this happened?)