Support for Bearer Token authentication header

[petbod-lm]

In Sweden the National Mapping and Land Registry (Lantmäteriet) has several WMS and ATOM services that require authentication for access using Bearer Token authentication headers.
Without authentication many of the ETF tests for WMS and ATOM services will fail as calls to, for example GetMap methods are blocked if a Bearer Token authentication header is not supplied.
The ETF validator currently supports Basic Authentication headers.
Please add support for Bearer Token authentication in the ETF validator.

An example of Bearer Token authentication is

HTTP Request header
Authorization : Bearer a9a380d6b6f2abcdefghijklmnop