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.

The scene now owns its renderer, so there is no need to keep a list
of existing renderers and to call Renderer::Get().

Seems to still build in lol, will check other works to be sure

Scene rendering logic is now better

Box objects (AABB) now have the long awaited extent() and center()
methods. Corners are now called “aa” and “bb” for convenience. The
WorldEntity class uses a box3 for its AABB instead of two vec3s.
This allows us to simplify a lot of verbose code.

and 2) fuck the Visual Studio compiler that crashes when confused.

scene so that g_scene can be deprecated later.

Added RemoveElement

- removed 0 CR characters
 - removed 0 trailing whitespaces
 - replaced 5 tabs with spaces
 - fixed 1 svn:eol-style properties

on automake platforms, too.

directory layout mess.