implement MathicsScanner in ply
progress
tokenize operators using reflect hack

cleanup MathicsScanner
refactor lexer
cleanup lexer
towards MathicsParser
towards MathicsParser
towards MathicsParser
cleanup of parsing rules
removed comment token
implement binary operator parsing
implement prefix and postfix operator parsing
remove get_rule form Operators (replaced with is_prefix and is_postfix
fix sequence parsing
fix slot and out parsing
cleanup MathicsScanner
start parser/scanner refactor
add PatternTest parsing
towards parser/scanner refactor
towards parser/scanner refactor