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

support for generate constructs outside of generate regions and genvar declarations in generate loops

- generally cleaned up and documented the Logic conversion
- made exprToLHS a shared helper function, now uses Maybe
- ported existing local exprToLHS helpers to the new one

- entirely new PackedArray conversion (always flattens)
- typedef and struct correctly order packed ranges when combining types
- Stmt LHS traversal no longer traverses nested statements to avoid double conversion
- Logic conversion applies to `initial` blocks`
- new and modified tests to cover these cases