Actually tell you if the server is running an incompatible version

There were a bunch of cases in HandleConnect for rejecting a client running a different version of the game. The problem is that clients just don't even try connecting to a server with an incompatible version. So I moved those cases to the client side.

Also did a bunch of refactoring, like turning refusereason into an enum.

It'd be great for stability if instead of completely removing the server checks, the client checks were added in addition to the server checks, for when older versions try to connect to newer versions with this change.

merged

mentioned in commit 6d76d05d

changed milestone to %2.2.10