Establishes a global config object for a TypeDispatcher instance, so far
with just properties representing comparison tolerances. Begins a
"relational" group of functions with basic approximate equality, and
an initial primitive ordering comparison. Ensures that methods that
depend on properties of `config` will be properly updated when those
properties change.
Reviewed-on: #19
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>
