set headers after XMLHttpRequest OPEN (video-dev#4424)

fixes video-dev#4422

Integrate CMCD data into outgoing requests. (video-dev#4346)

* Integrate CMCD data into outgoing requests.

* Fix sanity test errors

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* Improve buffer length calculation

* - Fix for init object type bug
- Add support for av object type

* Add support for separate buffer and top bandwidth values for audio and video

* Use loader composition instead of context transformation

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* Only override loaders and add listereners if cmcd is enabled

* Add context header processing to fetch-loader

* Convert CMCD to a plugin

* Fix issue with quotes not being escaped

* Fix doc data type

* Remove unneeded JSDoc annotations

* Add proper data types for buffer properites

* Add backslash escape

* Use inline class to overload loaders

* Move token processing to its own block

* Optimize multiple references to this

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* Remove unused argument in apply function

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* Update cmcd API docs

* - Remove tokenized custom field code
- Make string case the fallback in serialization routine

* Update README

[skip netlify] Update dependency ace to v1.4.13 (video-dev#4351)

Co-authored-by: Renovate Bot <[email protected]>

 v1.0.11

 v1.0.11-beta.1

Fix type for 'debug' field in config (video-dev#4279)