Remove base-class, Status and ErrorMessage

[abergs]

This PR removes the Fido2ResponseBase-class, which had two fields:

• Status
• ErrorMessage

These were never used by the library, only in demoes/samples.

If I recall correctly the reason for these fields are the conformance test tool which looks for them. As such, they should be added in the endpoints that we test against, and not used in the library itself since all errors are handled by throwing exceptions anyway.

Note: This PR is bases for discussion.

[abergs]

@aseigler @iamcarbon I would appreciate your input here in case I've missed anything important.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.95%. Comparing base (184f70f) to head (033a3a4).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #529      +/-   ##
==========================================
- Coverage   74.04%   73.95%   -0.10%     
==========================================
  Files         100       98       -2     
  Lines        2655     2638      -17     
  Branches      446      446              
==========================================
- Hits         1966     1951      -15     
+ Misses        588      586       -2     
  Partials      101      101              

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[iamcarbon]

@abergs I had also explored removing the base class during the initial refactoring (they were mixing concerns) -- and agree this is a good time to take the break and move these values to the endpoints.

[abergs]

Alright, I was able to run the conformance tests on this branch and it went fine. Will merge once tests are OK.