julia: enable threaded rendering

Move maintenance of per-frame variables into julia_prepare_frame(), which
requires making them static file-scope globals for now.

Also make minor adjustments to the code to make less assumptions about the
fragment being rendered (like it's x/y coordinates being 0, etc.)

A future commit will probably add an initializer function to
rototiller_module_t, with an opaque pointer output which will be fed to all
the module methods so these globals can be encapsulated and instantiated.

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