Add /chatpatches command to open config

[MisterCheezeCake]

The title says it all. This PR adds a command to open the config screen, so you don't need to go through modmenu if you don't want to.

[mrbuilder1961]

this is a fine addition but i can't switch it to the new omni branch without it messing up a ton of stuff, so you either need to figure out how to avoid that or just make a new PR on the omni branch. thanks