montage: add montage module

This is somewhat unfinished as it uses the generic tiled fragmenter
that's not interested in appearances but prioritizes total coverage
and simplicity.

Montage should have its own tiler that can produce non-square and even
non-uniform tile dimensions, prioritizing filling the screen with
mostly-uniform tiles.

But that's a TODO item, this is good enough for now and exercises some
fragment details previously irrelevant and often ignored/broken in
modules.

The pixbounce module in particular seems completely broken with small
fragment sizes.

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