Added missing translation of \f and \b

[PieterOlivier]

Formfeed and backspace support was missing from char2int and from String::deescape

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 50%. Comparing base (27c2891) to head (78117e8).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
...org/rascalmpl/values/parsetrees/SymbolFactory.java	0%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##              main   #2135    +/-   ##
========================================
  Coverage       49%     50%            
+ Complexity    6251    6248     -3     
========================================
  Files          675     673     -2     
  Lines        59270   58832   -438     
  Branches      8642    8599    -43     
========================================
- Hits         29579   29577     -2     
+ Misses       27458   27013   -445     
- Partials      2233    2242     +9     

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