FIX: issue #699 (Parse does not match integer range loop on bitset)
FEAT: added support for hexadecimal literals to lexer.
FEAT: added support for multiline comments to lexer.
FEAT: added support to lexer for simple construction syntax.
FEAT: replaced old ASCII tokenizer by the new Unicode runtime lexer.

- LOAD is now fully defined at mezz level and relies on TRANSCODE function.
- DO temporarily lost his support for string! argument.
Adding simple decimal rule.
Fixed previous typos and adding initial trans-decimal routine (currently returning only integer)
Adding missing optional sign for exponential part in the decimal-rule
Improved decimal-rule to handle exponential notation without decimal point and prepared trans-decimal routine for real conversion once there will be decimal! in Red
Initial float! datatype definition