Third Release: Usability Improvements

• Stack effects in function definitions, format : (a b -- c)
• Reading commands from stdin and via -c option.
• Dynamic type checking and stack effects (optional) with --validate.
• Display of execution statistics with --stats.
• Assert shows the exact location of the assert.
• Disabling of the ANSI color codes -p or --plain.
• Stack is printed in left-to-right order to match verbose mode.
• Documentation of the standard library.
• Interpreter step is reusable on its own, also can_execute.
• Additions of a few new operators: drop, remove, unary, str-*, etc.
• Dictionary support: words to create, fetch and store.