Wonder Room support

[c0d3rman]

Hi folks, I saw this was mentioned a few years back on #348 but I thought I'd open an issue for it. It would really be great to have support for Wonder Room as a field effect. I've been trying to do some exhaustive searches on damage values for a few setups and not having the ability to use Wonder Room makes it really difficult. On the web interface it's only slightly annoying to flip all the base stats, EVs, and boosts, but from the code it's a nightmare. Thanks.