Support file upload/paste in modals

[SocksTheWolf]

https://discord.com/developers/docs/change-log#introducing-the-file-upload-component-in-modals

This might have support in Discord.py now, we should check.

[SocksTheWolf]

It does in nightly, apparently will be released in 2.7. We should move to this and rework this modal to be less trash.

[SocksTheWolf]

See this for examples https://github.com/Rapptz/discord.py/blob/master/examples/modals/report.py

[SocksTheWolf]

Would like to have this before any public listing

[SocksTheWolf]

This discord py version has been released so we could make this work