Remove unused resolution code

[cycraig]

Description of change

Removes obsolete, unused code and error variants related to universal resolver functionality. This was unmaintained and not ported to the bindings and so has little effect on users.

Removed

• Remove Dereference.
• Remove DocumentMetadata.
• Remove InputMetadata.
• Remove Resolution.
• Remove ResolutionMetadata.
• Remove ErrorKind.
• Remove Resource.
• Remove PrimaryResource.
• Remove SecondaryResource.
• Remove MetaDocument.
• Remove ResolverMethod.
• Remove resolve.
• Remove dereference.

Links to any relevant issues

Fixes #532.

Type of change

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

Tests and examples pass locally. Nothing used this code.

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[olivereanderson]

LGTM!