Dialplan custom

[ovv]

Current dialplan was not correct and complicated. This rework
simplify it greatly and provide an easy way to do your own routing

I think it will be a nice place to put helpers for
authentifications.

No idea if that will provide any advantages over a flat mapping
of methods / middlewares

issue #78

[codecov-io]

Codecov Report

Merging #106 into master will increase coverage by 0.39%.
The diff coverage is 90%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   70.48%   70.87%   +0.39%     
==========================================
  Files          15       15              
  Lines        1562     1528      -34     
  Branches      267      264       -3     
==========================================
- Hits         1101     1083      -18     
+ Misses        342      328      -14     
+ Partials      119      117       -2

Impacted Files	Coverage Δ
aiosip/dialplan.py	100% <100%> (+40%)	⬆️
aiosip/application.py	71.81% <85.71%> (+0.57%)	⬆️
aiosip/dialog.py	73.49% <0%> (ø)	⬆️

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[vodik]

I really like this. And I suspect your right.

If anything, maybe it makes sense to stack/nest dialplans rather than trying to support middleware directly: e.g. outer layer handles authentication, then lets the next layer resolve