Changes:
- Preserve non-integer literals that contain valid integer specifications.
- Add binary integer specifications
- Add octal integer specification
- Zero (0) is considered an octal number
- Add negative lookbehind/lookahead for number specifications (text is not word/token based)
- Add method to evaluate constant expression for define constant expressions
- Replace int conversion with constant evaluation expression
  - int conversion failed for hex numbers due to default base 10 [int(s)] vs unknown base [int(s, 0)]
- Add additional tests