CORE-2013: removed support for CAS and WSO2 authentication.

[slr71]

While I was at it, I also fixed a bunch of lint warnings.

Most of the lint warnings were in one of these categories:

• Symbols that couldn't be resolved because they were defined by non-standard macros. For these cases, I either found a way to tell clj-kondo to handle the definitions or ended up adding declarations to get rid of the warnings.
• Using :use instead of :require to include other namespaces. In this case, I simply switched to using :require instead.
• Unused variable bindings. In most of these cases, I simply prefixed the variable name with an underscore.
• Type hints on the function instead of the parameter vector. In these cases, I moved the type hints.

[slr71]

Thanks for the review! I'm going to merge this now! 👍