[Bug 1783475] Re: const link support can't handle escaped charactors

[Andrew Johnson via Core-talk <core-talk at aps.anl.gov>]

PR for my json5 branch on GitHub at https://github.com/epics-base/epics-
base/pull/86

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https://bugs.launchpad.net/bugs/1783475

Title:
  const link support can't handle escaped charactors

Status in EPICS Base:
  Triaged
Status in EPICS Base 3.16 series:
  Won't Fix
Status in EPICS Base 7.0 series:
  Triaged

Bug description:
  I think the following should work, but it doesn't.  The culprit seems
  to be the call to dbTranslateEscape() in dbRecordField() and
  dbRecordInfo().  The escaped newline is handled correctly by dbLex,
  but the later dbJLinkParse() errors on the now unescaped newline.

  > record(stringin, "test") {
  >      field(INP, {const:"multi\nline"})
  > }

  > dbJLinkInit: lexical error: invalid character inside string.
  >                          {"const":"multi line"}
  >                      (right here) ------^

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