more inconsistencies with other forks

Dependencies

• [2] TNRO6KLZ new live app
• [3] SEJ76JDA keep templates in sync
• [4] 3EW4YU6L couple of typos

Change contents

• replacement in main.lua at line 12
  [2.520]→[2.520:588](∅→∅)
  − -- save the message's value to a specific, unused numeric prefix
  [2.520]

  [2.588]
  + -- save the message's value to a new, smallest unused numeric prefix
• edit in main.lua at line 14
  [2.612]

  [2.612]
  + -- if there's an error, go back to the previous value of the same

  + -- definition if one exists
• replacement in main.lua at line 17
  [2.615]→[2.615:752](∅→∅)
  − -- if a game encounters an error:

  − -- find the previous version of the definition in the 'head' numeric prefix

  − -- decrement 'head'
  [2.615]

  [2.752]
  + -- if a game encounters a run-time error, send it to the driver and await

  + -- further instructions. The app will go unresponsive in the meantime, that

  + -- is expected. To shut it down cleanly, type C-q in the driver.
• replacement in main.lua at line 28
  [2.912]→[2.912:942](∅→∅)
  − -- these can be modified live
  [2.912]

  [2.942]
  + -- these will be modified live