[Commands] Cleanup #rules Command. (#2593)

* [Commands] Cleanup #rules Command.

- Cleanup messages and logic.
- Rewrite all rules logic to use `std::string` and repositories.

* References

* Update rules.cpp

* Strings::Equal and Strings::EqualFold.

* Cleanup.

* Update rulesys.cpp

* Update rulesys.cpp

Co-authored-by: Akkadius <akkadius1@gmail.com>

zone/client.cpp

@@ -11837,7 +11837,7 @@ bool Client::SendGMCommand(std::string message, bool ignore_status) {
 void Client::RegisterBug(BugReport_Struct* r) {
 	if (!r) {
 		return;
-	};
+	}
 
 	auto b = BugReportsRepository::NewEntity();