til: wire up til_video_setup_t throughout *_fb

Preparatory commit for aspect ratio settings at the fb layer.

This slightly reworks how main::setup_video() integrates the
selected fb backend's setup_func to better resemble how the
module setup_funcs work now, with more clearly separated
settings-building and setup-baking/finalizing phases.  Which
makes inserting the ratio setting in the middle of the front-end
and back-end setup_funcs fairly trivial.

Not a fan of all the casts, but there will probably be more
helpers introduced to take care of that and make
til_video_setup_t more of a first-class thing facilitating the fb
stuff.

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