render: Introduce render context object.

Due to the declarative modules feature of Guile 2.9.4+, the existing
technique of using one top-level variable per GL state was very broken
because the initial values got cached at all call sites and state
updates were being silently ignored and thus the game window was
always a black screen.  Not good!  By replacing all of the state
variables with a single "context" object and poking at fields inside,
things work again and it's arguably the better design anyhow.

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