use discord modals for complex commands

[Haiyn]

Use the newly introduced discord modals (discord.js v13.7.0) to make complex commands (start, cc add, oc add) more usable.

See: https://discord.js.org/#/docs/discord.js/stable/class/Modal

• [ ] Mobile support?
• [ ] Dynamic component amount in modal for start?

[create-issue-branch[bot]]

Branch xenon-168-use-discord-modals-for-complex-commands created!

[Haiyn]

Issues:

• There doesn't seem to be any other input type than text
• You can only put 5 fields at max into a modal

This will stay on hold for now.