Added unified config

[ask0n]

Breaking change: After the update existent session file(if any) should be renamed into cctv.session or a new login session will be initiated.

All config parameters are stored in the single config file.

• [x] During the start bot creates config.yaml with desired parameters and defaults
• [x] Added system_version parameters to clearly indicate session in TG client
• [x] Config file is excluded in .gitignore