Telethon support. Custom MTProto implementations. Stable first release

[MarshalX]

TODO list:

• [x] bump tgcalls version to 1.0.0
• [x] remove BETA from copyright message
• [x] update dev status and so on in tgcalls package
• [x] add default join as in pyrogram impl
• [x] optimize requests close #97
• [x] try to run all example
• [x] add one example (playout mb) for Telethon
• [ ] create release on github

close #104 close #103 close #99 close #96