(traceviewer) try to parse most common debug_merge_point formarts out there

Merged krono requested to merge branch/traceviewer-common-merge-point-formats into branch/default

Includes:

  • PyPy (clearly)
  • PyPy cffi callbacks
  • RSqueak
  • js
  • pycket
  • others (hippy, topaz) via fallback

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