Clean up libdemo

Dependencies

• [2] QICPGJ2D Make simple.c dump more concise
• [3] 7QIEZSZI Add tiv
• [4] M5U5PAX7 Add wrapper script, improve libdemo
• [5] 7AUC4NKI Initial commit
• [6] VMUKZQZR Work on 02-nix-build
• [7] 52F4Q6CJ Update README
• [8] JGZ7GBCL Add linting

Change contents

• replacement in libdemo/libdemo.sh at line 149
  [2.70]→[4.58:114](∅→∅),[4.2427]→[4.58:114](∅→∅)
  − if [ "${expect:-success}" = failure ]; then
  [2.70]

  [4.2469]
  + if [ "${__libdemo_expect:-success}" = failure ]; then
• replacement in libdemo/libdemo.sh at line 153
  [4.2919]→[4.115:171](∅→∅)
  − if [ "${expect:-success}" = success ]; then
  [4.2919]

  [4.2960]
  + if [ "${__libdemo_expect:-success}" = success ]; then
• replacement in libdemo/libdemo.sh at line 173
  [4.3506]→[4.343:366](∅→∅)
  − expect=success
  [4.3506]

  [4.3523]
  + local -r __libdemo_expect=success
• replacement in libdemo/libdemo.sh at line 178
  [4.3561]→[4.367:390](∅→∅)
  − expect=failure
  [4.3561]

  [4.3578]
  + local -r __libdemo_expect=failure
• edit in libdemo/libdemo.sh at line 222
  [3.334]

  [3.334]
  + else

  + echo "no colour output available, use your imagination!"