[Feature Request] add a feature to block client to join if hash are mismatch (also have some issues)

[CoolLKKPS]

@darmuh so that feature should work like:

1. if client don't have the mod, cause network error (just like lobby improvement)
2. if client sha256 (or something that can check if the dll has been tampered with) and hash value are mismatch, block client to join
3. config option to disable expect hash feature, only check modlist hash

also conflict with BMX-LobbyCompatibility for now

wish u or someone else can pick up this mod, thanks in advance for ur reply