Release: YUV Color, v0.2

A public release of the YUV Color patch, updated to work on Leopard.

This version fixes some timing issues that would cause the patch to execute needlessly when the inputs didn't change. This will provide marginally higher performance for compositions using this patch (probably immeasurable though).

It also autoupdates old compositions to use the newer patch object; This was necessary because we've changed some internals that would otherwise break it.