Cleanup of pointer-in-range predicate handling

[tautschnig]

Make sure expr2ct knows how to print it, add a full API, cleanup comments.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Base: 78.48% // Head: 78.47% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (08fde08) compared to base (43f71f3).
Patch coverage: 60.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7459      +/-   ##
===========================================
- Coverage    78.48%   78.47%   -0.01%     
===========================================
  Files         1663     1663              
  Lines       191136   191174      +38     
===========================================
+ Hits        150017   150033      +16     
- Misses       41119    41141      +22     

Impacted Files	Coverage Δ
src/ansi-c/c_typecheck_expr.cpp	76.06% <ø> (ø)
src/ansi-c/expr2c_class.h	100.00% <ø> (ø)
src/util/pointer_expr.h	96.72% <25.00%> (-2.31%)	⬇️
src/ansi-c/expr2c.cpp	67.71% <53.84%> (-0.17%)	⬇️
src/goto-programs/link_to_library.cpp	100.00% <100.00%> (ø)

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