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First stab at supporting explicit aspect ratios.
This performs the adjustment when needed in til_fb so it's
automatically applied to all fb backends.
The syntax is ratio=W:H with ratio=full being special cased for
when no aspect ratio adjustment is desired (just use whatever the
fb page dimensions are, usually specified via size= in the fb
backend's settings, or display native res when fullscreen=on)
For now when an aspect ratio is specified it always fits the
content within the alotted space... there is no
full-but-ratio-preserved-by-clipping-if-needed variant like widescreen
TVs often have.
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