Add dropdown to /inventory command for quick navigation (#365)

- Add ability to handle dropdown menus with the bot
- Add a dropdown to the inventoryhelper
- Add handler for the dropdown to navigate to that page

#344

Reviewed-on: #365
Reviewed-by: VylpesTester <tester@vylpes.com>
Co-authored-by: Ethan Lane <ethan@vylpes.com>
Co-committed-by: Ethan Lane <ethan@vylpes.com>

src/bot.ts

@@ -38,6 +38,7 @@ const client = new CoreClient([
 
 Registry.RegisterCommands();
 Registry.RegisterButtonEvents();
+Registry.RegisterStringDropdownEvents();
 
 if (!existsSync(`${process.env.DATA_DIR}/cards`) && process.env.GDRIVESYNC_AUTO && process.env.GDRIVESYNC_AUTO == "true") {
     console.log("Card directory not found, syncing...");