feat(bots/discord): framework changes and new features

- Migrated to a new command framework which looks better and works better
- Fixed commands not being bundled correctly
- Added message (prefix) commands with argument validation
- Added a new CommandErrorType, for invalid arguments
- `/eval` is now a bit safer
- Corrected colors for the coinflip embed
- `/stop` now works even when the bot is not connected to the API

bots/discord/config.js

@@ -4,6 +4,7 @@
  * @type {import('./config.schema').Config}
  */
 export default {
+    prefix: '!',
     admin: {
         users: ['USER_ID_HERE'],
         roles: {