v1.5.4

• Add support for true and false boolean literals in if conditions and macro arguments.
  • true evaluates to 0x01, false evaluates to 0x00.
  • Example: if (true) { 0xAA } else { 0xBB }
• Fix macro argument scoping bug where parameters leaked across macro boundaries (fixes #139).
  • Macros can no longer access parameters from parent scopes unless explicitly passed.
  • Example: If M1(arg) calls M2() without passing arg, then M2 cannot use <arg>.
• Fix nested macro invocation resulted in stack overflow (fixes #140).
  • Example: M1(M1(M1(<a>)))