Re-implement Telegram Support

[lawliet89]

This is related to #14.

Right now there are two big problems with the two Telegram crates:

• One is too old and can't work with new hyper. I would have to update the crate itself to use something newer (like reqwest) AND also update its dependencies (multipart)

• Two depends on a crate that uses custom derives that has been superseded by proc_macro in 1.15.

• Rip out current Telegram support (Remove Telegram feature #18)

• Implement a websocket (?) endpoint that spits out broadcast messages (Implement WS endpoint #43)

• Implement a separate Telegram "client" to restore removed features (https://github.com/sturdek/pr-demon-telegram-bot)

[lawliet89]

See https://crates.io/search?q=telegram

Maybe https://github.com/voider1/teleborg ?