add life loopHEADmain

- add labels for DEAD and ALIVE so I can change what character is which
- when return is pressed, start life loop; no more input handling
- change s16b and s16b2 to no longer destroy X (needed for life loop)
- this is an okay first prototype, but it is slow; could use one byte
  for 8 cells but that would've been harder to implement - premature
  optimisation is the root of all evil

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