Added webrtc participant version

Merge pull request #26 from Bandwidth/release/2021-03-08-21-39-37

webrtc new field

MFA error update and message priority

Merge pull request #24 from Bandwidth/add-missing-plugins

added missing plugins

Voice and MFA Schema Changes

General

• Updated voice and multi-factor authentication schema and disabled media url encoding.
• Resolved the following CVE. https://nvd.nist.gov/vuln/detail/CVE-2021-20190

WebRTC Optionally Prepend XML

Optionally prepend XML header in WebRtcTransfer.generateBxml()
We need to make this function more flexible in the case where users have other BXML they want to include. I'd remove the XML header altogether but that would be a breaking change. Thus I added a flag that defaults to true.

Tag & SipUri BXML

v3.11.0

removed auto release due to failure with timeout