Modernise bsda:tty code style
Modernise bsda:tty code style

changed src/bsda_tty.sh
- Use markdown tables
- Use compact class header style
- Remove last full stop from annotations
- Ditch jfbterm support and thus permit the use of tput DO # and tput UP #
- Recombine some tty access into a single pipe

lonkamikaze/bsda2,lonkamikaze/bsda2