Add an example for projection

[Vrixyz]

This Pr also adds some common code for macroquad examples

Screencast.from.09-03-2024.11.56.59.AM.webm

[Vrixyz]

now unrelevant remark

comment on 44c81cc#diff-29153b3f3e1c69433be25eaee50af1c1868263c95d46f2132ba1a1f7ba860e6cR10-R15

the vertices seem incorrect:

See (left = current indices ; right = indices order after transforming into convex polyheron, which works fine):

[sebcrozet]

The point type selection needs to be simplified in cuboid_to_trimesh.rs, but looking good otherwise. Thanks!