Prompted by issue #1972 (closes #1792 and close #830)

[GillesDuvert]

see issue #1972

• strings and octals correctly defined in accordance with IDL8.8 +:
  • a="8ull & print,a produces a STRING containing "8ull & print,a"
  • a="7ull & print,a prints 7, as "7ull is an octal.
  • etc, see issue for examples.
• close also Record terminator slash (/) in format not supported #830 the SLASH is now correctly supported in formats.

[codecov]

Codecov Report

Attention: Patch coverage is 72.60274% with 40 lines in your changes missing coverage. Please review.

Project coverage is 42.47%. Comparing base (f2bdf27) to head (c61de29).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
src/FMTParser.cpp	68.83%	24 Missing ⚠️
src/GDLLexer.cpp	78.33%	13 Missing ⚠️
src/FMTLexer.cpp	66.66%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1984      +/-   ##
==========================================
+ Coverage   42.45%   42.47%   +0.01%     
==========================================
  Files         444      444              
  Lines      110158   110257      +99     
  Branches    22055    22077      +22     
==========================================
+ Hits        46773    46829      +56     
- Misses      63385    63428      +43     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.