chan_websocket: Allow additional URI parameters to be added to the outgoing URI.

[gtjoseph]

• Added a new option to the WebSocket dial string to capture the additional
  URI parameters.
• Added a new API ast_uri_verify_encoded() that verifies that a string
  either doesn't need URI encoding or that it has already been encoded.
• Added a new API ast_websocket_client_add_uri_params() to add the params
  to the client websocket session.
• Added XML documentation that will show up with core show application Dial
  that shows how to use it.

Resolves: #1352

UserNote: A new WebSocket channel driver option v has been added to the
Dial application that allows you to specify additional URI parameters on
outgoing connections. Run core show application Dial from the Asterisk CLI
to see how to use it.

[gtjoseph]

cherry-pick-to: 20
cherry-pick-to: 21
cherry-pick-to: 22
cherry-pick-to: 23

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[InterLinked1]

This is kind of opinionated... but some of the line wrapping in this seems a bit excessive... I see a lot of lines wrapped at 60-70 characters? Even if unrolled onto a single line, most of them would be under 90 chars, which is the (I believe obsolete) formatting rule mentioned in the documentation.

[gtjoseph]

@InterLinked1 Are you talking about the commit message/PR description or the source files themselves?

[InterLinked1]

@InterLinked1 Are you talking about the commit message/PR description or the source files themselves?

I'm talking about the source code itself

[gtjoseph]

Hmmm. I'm going to add a check to make sure the parameters are in fact encoded (or don't need encoding).

[gtjoseph]

I've added validation to the uri params to make sure each name and value either doesn't need to be encoded or is already encoded.

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