render: Add separate projection and model-view matrix stacks.

Just like the Opengl 2.x days! ;)

* sly/render.scm (graphics-transform, graphics-transform-mul!,
  graphics-transform-identity!): Delete.
  (graphics-model-view-transform, graphics-model-view-mul!,
   graphics-model-view-identity!, graphics-projection-transform,
   graphics-projection-mul!, graphics-projection-identity!): New
   procedures.
   (with-model-view-excursion, with-projection-excursion): New syntax.
   (call-with-transform-excursion): Move matrix copying out of the "in
   guard."
   (draw-scene): Use new matrix stacks.

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