(Image credit: Valve) Valve has released a huge update to the Steam Community Market, which is ostensibly in beta though it has already been enabled for all Steam users (you can choose to opt-out). It is a big change in how the whole thing looks, feels and works, with a bunch of significant upgrades along with more granular tweaks to the whole experience of buying a virtual gun. PC Gamer's already covered the changes , though I'll go over some of them again, but the main reason I noticed the update was that a Counter-Strike gun I've had listed for ages, and had long since forgotten about, somehow sold earlier this week. It was an M4A1-S Guardian skin in "Field Tested" condition, and I'd stuck it up years ago for $40 and promptly forgotten about the whole thing. (Image credit: Valve) As for the wider marketplace changes, a quick whistle stop tour. Item listings are nice and all, but you know what's better? BIGGER item listings.…