Release 0.5.0

Create Sphinx docs

Consider parameter names when validating signatures

Resurrect MRO rank

Don't type-check variable-length tuples in full

Simplify param_specificity

Performance tweaks

Add pytest option for specifying the typing module to use

Inspect and wrap generics during registration

Track parameter complexity and cache all invocations

Consolidate signature inspection logic

Split type_tier and type_specificity

Type variance

Cleanup

Locate known base generic; typing 3.5.0 compat