- support ports with sizes which depend on constant functions
- restore package item injection utility to package conversion module
- additional unbased unsized conversion test coverage

- new net decl to replace net pseudo-type
- support nets with complex base types, including typenames
- support var declaration type prefix for all data types
- support var as lone type shorthand
- refactor AST representation of strengths
- traversal helpers for treating nets as variables
- use decl traversals where appropriate

- pattern keys now represented as TypeOrExpr
- support for simple integer struct pattern keys

- reduces the number of cast functions which are generated
- adjust package_function_cast to preserve cast converage
- fix issue where cast functions would be generated before localparam
  substitution within a procedure

This reverts commit 51f2d2bb.

- number literals are parsed rather than stored as strings
- fix array query functions used on non-trivial number literals
- more efficient expression simplification recursion
- expanded constant folding scenarios

- support ubased unsized bound to ports using injected constants
- explicit context-aware literal sizing for complex expressions
- fix infinite loop case in NestPI conversion
- elaborate size-casts of converted literals

- NestTF refactored to cover all package items
- fixed issue where type traverse skipped typedefs