* Add RequestID to the RequestScope
* Expose RequestID to auth & request loggers
* Use the RequestID in templated HTML pages
* Allow customizing the RequestID header
* Document new Request ID support
* Add more cases to scope/requestID tests
* Split Get vs Generate RequestID funtionality
* Add {{.RequestID}} to the request logger tests
* Move RequestID management to RequestScope
* Use HTML escape instead of sanitization for Request ID rendering
Reorganized the structure of the Request Utils due to their widespread use
resulting in circular imports issues (mostly because of middleware & logger).
