- struct conversion handles directionality of fields
- struct conversion supports minus part selects
- fixed incorrect handling of directional part selects in multi-packed
  conversion
- multi-packed conversion defines standard ranges in terms of
  directional part selects for clarity
- fixed potential loop due to overeager untagging in multi-packed
  conversion

- adds support for using macros and macro arguments within the argument
  list to other macros
- fixes an issue where macros with arguments would have extraneous
  whitespace
- fixes handling of multiline string literals

- param type conversion properly supports deferred param type resolution
- fixed struct conversion incomplete Subroutine traversal
- struct conversion excludes param types from conversion
- parameters are defaulted to have integer type

- also fixes an issue where system tasks were inadvertently prefixed
  during the interface conversion

- Trace comments cover module items, decls, and stmts
- Added pseudo-lexer to Alex parser for monadic Position production
- Added Position to every DeclToken
- Removed Comment PackageItem
- Added CommentStmt and CommentDecl
- Fixed traversal skipping outer MIAttr ModuleItems
- Generally cleaned up Parser modules