Implement checking for filter and method authentication requirement.

Currently no filter items are defined pending confirmation of which
require it.

Please do not merge yet.  Will complete the `sx-request-make` and `sx-method-call` changes on this branch.
Frankly, I think it would get in the way more than it would help. Filters and keywords are usually passed as variables, so auto quoting them would be bad. 
This means we'd have to quote some arguments but not others. But then that's inconsistent and arbitrary. 

I personally prefer what we have now.