Video converter: nearest neighbour scaling corruption

Fix corruption when using nearest neighbour scaling that's caused by generating unnecessary intermediate data into a shared temporary pixel buffer that actually points to the output video frame. Also add a compositor example that exercises the problematic case.

video-converter: Skip input lines where possible.

There is a case where there are no lines in the temp cache, and
it's possible to skip straight to the request line and not generate
intermediate ones. This is really only beneficial when doing
nearest-neighbour downscaling, as other methods generally require
all input lines sequentially to generate the output. In that case,
this change has no effect and all lines are generated and cached
as before.

As a side effect however, this fixes corruption when downscaling
using nearest-neighbour, as interactions with the pass_alloc flag
and reuse of temporary lines causes the unecessarily-generated
cache lines to overwrite the final output.