[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/command.h

@@ -32,6 +32,7 @@ void ListModifyNPCStatMap(Client *c);
 std::map<std::string, std::string> GetModifyNPCStatMap();
 std::string GetModifyNPCStatDescription(std::string stat);
 void SendNPCEditSubCommands(Client *c);
+void SendRuleSubCommands(Client *c);
 
 // Commands
 void command_acceptrules(Client *c, const Seperator *sep);