WIP: Channels

[Netzvamp]

This will be WIP for a while, since it has breaking changes and needs good testing.

Implementation to this discussion: #34

In short:

We separate the different channels of a freeswitch session to python objects, so that we can apply command directly to single them. That way we can wrap complex dialplan logic in readable python code.

https://github.com/Netzvamp/Genesis/tree/channels/examples

Currently open:

• bgapi for most of the api calls for more async behavior. For originate this is a must.
  • Implement robust bgapi object tracking like we do for execute
• more and better exceptions and hangup detection
  • In this branch Outbound session blocking problem with sendmsg(block=True) when session is terminated (hangup) #35 is handled by detecting the hangup, not by waiting for timeout
• mod_conference implementation, to mix 3 or more channels
• implement spy/evesdrop
• Update tests to new structure
  • More robust tests with explicit stop of all handler, consumers, ...
• More and better examples
• Update cli tools
• Sphinx docs + pages with examples and tutorials
  • Generate with github actions
• A router to send calls to different handlers based regex and call variables (e.g. destination number)
• Example that rebuilds fs_ctl in python, to show the capabilities of genesis

I aim to make this as pythonic as possible while keeping the ability to send custom api commands as needed.

Timeline is unknown for now.