Created the clear.cpp command

src/commands/clear.cpp

@@ -0,0 +1,8 @@
+#include "clear.h"
+#include "api/util.h"
+
+void clear::execute(sql::Connection &con, dpp::cluster &bot, const dpp::slashcommand_t &event) {
+    util::executeQuery(con, "DELETE FROM channels WHERE guildId = ?", {event.command.guild_id.str()});
+
+    util::sendSuccess(event, "All channels have been unregistered.");
+}