Legacy ping support (#4062)

* Detection of protocol versions before 18w47b

* Refactor old_protocol_versions into protocol_version

* Ping servers closer to how a client of an instance's version would ping a server

* Allow pinging legacy servers from a modern profile in the same way a modern client would

* Ping 1.4.2 through 1.5.2 like a Vanilla client in those versions would when in such an instance

packages/app-lib/src/util/mod.rs

@@ -3,4 +3,5 @@ pub mod fetch;
 pub mod io;
 pub mod jre;
 pub mod platform;
+pub mod protocol_version;
 pub mod server_ping;