RIP ServerMainMenu-Lib. Long Live SimpleMainMenu-Lib!

TBH the name was outdated, since it could do more than just theme a menu around a server. So figured I'd change it with the Minecraft version, since a lot of updates are required to update to Minecraft 26.1.

Also Splash Text can now be multiple lines, which is very neat in my opinion. Also broke older theme mods, so let's have both in the same update to minimize the damage!

If you're interested in the full changelog check it out here: https://mosadie.link/smm-lib/version/3.0.0