This lets us get rid of m_autorelease and m_destroy and we’ll be able
to implement init_game/init_draw later, for stuff that must happen
on the render thread.

Now TickDraw() can be called several times per frame, because we
may have several scenes. This is expected, but it will require
some adjustments later.

Using “Array” instead of “array” is now fully deprecated, and I replaced
the Log::Debug() etc. functions with msg::debug() etc. because log:: was
unavailable due to being a maths function.

Added up-to-date copyright notice and BOM to modified files, just in case.

scene so that g_scene can be deprecated later.

optimisation flag -Os instead of -O3.

"half" class. The build is now 3% faster.

together with the --enable-experimental flag. Use LOL_DEBUG and
LOL_RELEASE instead of the previous values.

one bug thanks to that.

joystick class, and put a header in each source file.

the game context and in the render context, and a ticker class that
takes care of the ticking.