Use a single foreign object guardian.

Rather than each foreign resource type creating its own guardian, let's
just use one instead so that there is only a single guardian to talk to
each frame.

* sly/guardian.scm: New file.
* Makefile.am (SOURCES): Add it.
* sly/game.scm (run-game-loop): Start guardian worker.
* sly/render/mesh.scm (mesh-guardian): Delete.
(free-mesh): New procedure.
(make-mesh): Guard newly created meshes.
* sly/render/shader.scm (shader-stage-guardian): Delete.
(free-shader-stage): New procedure.
(make-shader-stage): Guard newly created shader stages.
(shader-guardian): Delete.
(free-shader): New procedure.
(make-shader): Guard newly created shaders.
* sly/render/texture.scm (texture-guardian): Delete.
(free-texture): New procedure.
(make-texture): Guard newly created textures.

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