Previously, when changing a pet's color, we would refresh the items panel and send a new network request for the item appearances, even though they're all the same. This is because item appearance data is queried by species/color, for ease of specification.
But! Item appearances are //cached// by body ID. So, if this is a standard color, it's not hard to look in the cache for the standard color's body ID!
Now, most color changes are faster and don't flicker the item panel anymore. We do still refresh the panel and send the requests for color changes that _do_ matter though, like standard <-> mutant!
