Implement Rip::Core::{Character,Integer}#{to_s,integer} to help when debugging
Implement Rip::Core::Boolean#{to_s,inspect}

Incidentally implement Rip::Core::Boolean.class_instance as well
Implement Rip::Core::{Class,Prototype}#{to_s,inspect}
Move some tests to where they should have been in the first place

Also extract 'debug methods' shared example
Implement Rip::Core::Lambda#{to_s,inspect}
Include arity when inspecting Rip::Core::Lambda

* Extract Rip::Core::Lambda#required_parameters
* Implement Rip::Core::Lambda#arity
Setup pattern for rendering core objects for debugging