[Commands] Cleanup #ban, #ipban, #flag, #kick, #setlsinfo, and #setpass Commands. (#2104)

* [Commands] Cleanup #ban, #ipban, #flag, and #kick Commands.
- Cleanup messages and logic.
- Add ServerFlagUpdate_Struct for flag updates.

* Add #setlsinfo and #setpass to cleanup.

* Update setlsinfo.cpp

* Update database.cpp

* Update database.cpp

* Update command.cpp

common/servertalk.h

@@ -1776,6 +1776,11 @@ struct ServerDzCreateSerialized_Struct {
 	char     cereal_data[0];
 };
 
+struct ServerFlagUpdate_Struct {
+	uint32 account_id;
+	int16 admin;
+};
+
 #pragma pack()
 
 #endif