Provide the original message to the dialplan

[vodik]

Probably should just expose the message rather than parts of it, as one might need more information when deciding how to handle new traffic. For example, holes in the current API: access to the uri, to header, contact header, and potentially extension headers.

[codecov-io]

Codecov Report

Merging #109 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #109   +/-   ##
=======================================
  Coverage   70.87%   70.87%           
=======================================
  Files          15       15           
  Lines        1528     1528           
  Branches      264      264           
=======================================
  Hits         1083     1083           
  Misses        328      328           
  Partials      117      117

Impacted Files	Coverage Δ
aiosip/application.py	71.81% <ø> (ø)	:arrow_up:
aiosip/dialplan.py	100% <100%> (ø)	:arrow_up:

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[vodik]

I've left method as its convenient and not to break too much at once. I really doubt anyone is using the username field.

[ovv]

If we go the route of the Dialplan like this we should ask ourselves what should and should not to be available in the resolver. For now that's ok for me.

[vodik]

@ovv agreed.