v1.1.4: Add bit text mode

1. Added bit text mode that uses variable length encoding bits
   to maximize compression. td5 still uses the fixed bit text mode.
2. Changed the random data metric to use number values init
   loop * 7/8 + 1 to be threshold for random data.
3. Implemented a static global for decoding bit text mode and
   string mode to limit reads of input values.