Give workspace locations symbolic names
ROOL authored
Detail:
  Describe the workspace locations relative to R12 and replace their uses
  at sites with LDR/STR and ADR.
  This fixes a significant bug where the SharedSound handle was being stored at
  a random offset depending on the contents of R8 rather than at offset 8
  within the workspace. Most likely a missing # in the original BASIC sources
  (so [R12,wksp_ss_handle] => [R12,R8]).
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