[CLI] Add mercs:enable and mercs:disable commands (#3416)

* [CLI] Add `mercs:enable` and `mercs:disable` commands

* Update descriptions

world/cli/mercs_disable.cpp

@@ -0,0 +1,33 @@
+#include "../worlddb.h"
+#include "../../common/database_schema.h"
+
+void WorldserverCLI::MercsDisable(int argc, char **argv, argh::parser &cmd, std::string &description)
+{
+	description = "Disables mercenaries";
+
+	if (cmd[{"-h", "--help"}]) {
+		return;
+	}
+
+	std::string input;
+	std::cout << "Warning! This will drop all merc tables, are you sure? [y/n]";
+	std::getline(std::cin, input);
+
+	if (Strings::ToLower(input) != "y") {
+		LogInfo("Aborting");
+		return;
+	}
+
+	std::string sql = "SET FOREIGN_KEY_CHECKS = 0;";
+	for (auto &t: DatabaseSchema::GetMercTables()) {
+		sql += fmt::format("DROP TABLE IF EXISTS {};", t);
+		LogInfo("Dropping table [{}]", t);
+	}
+
+	sql += "SET FOREIGN_KEY_CHECKS = 1;";
+
+	database.QueryDatabaseMulti(sql);
+	LogInfo("Setting rule Mercs:AllowMercs to false");
+	RuleManager::Instance()->SetRule("Mercs:AllowMercs", "false", &database, true, true);
+	LogInfo("Disabled mercs and dropped tables");
+}