Bob/relax requirements

Disable infinite recursion in ScalarConstant::node_id()

Use direct implementation of is_parameter, is_op

Add topological sort and viualization classes

Cyphers/literal

A few using types for things that aren't class-worthy to help with {} initializers

Element types needed some reorganization to allow literals to know what kind of values to hold.

Cyphers/function

Two shape propagates/checks, bulk of ops.

update compiler warnings