compiles fp16 basic stuff now!

also started extending the scanner / parser

fixes issue-2317: missed protection of \n in STRstring2SafeCEncoding in str.c

See merge request !202

This was not needed so far as in the old ctinfo implementation all \n were encoded by @. The new, customisable error messages in ctinfo no longer do this.

improved readability of SCS (symbolic constant simplification)

Closes #2316

See merge request !201

mainly replaced SCSisRelationalOnDyadicFn by relation specific versions. This allowed for folding the ones for <= with >, and >= with <.
It also made SCSextractCompositionInfo redundant which was a rather complex, ie. difficult to understand abstraction in the first place.

Error streamlining

Closes #2282

See merge request !176

also force correct include path for macos systems

With this change, we avoid having to initially link against sac2cShared.
Furthermore, we remove the base-env links from runtime tests as these
make no use of sac2cShared functionality. Within the base-env source
file we remove the explicit header inclusion and instead use an extern
definition; this is done to avoid having to depend on XSL generated
files (e.g. `types.h` includes `types_nodeypes.h`).

Finally we add a readme on how to create new tests.

• Make two functions static in ctformatting.c.
• Remove global.h import from ctinfo.c.
• Move CTFintialize from main to OPTanalyseCommandline.
• More changes not worth mentioning.

• Add CTIerrorBegin/End call to a CTIerrorContinued call site that was missed in an earlier commit.
• Add end-to-end test for CTIerrorBegin/Continued/End.
• Rename error end-to-end tests to have consistent naming.
• Expand test-error-generic to additionally test line wrapping and custom header arguments.
• Fix inconsistent CTIerror behaviour by moving the CTFinitialize call from OPTcheckOptionConsistency to main.c.

• Refactor ctinfo.c to rely on ctformatting.h.
  ○ Decouple various calls to ctformatting.h using macros.
  ○ Remove ProcessMessage, Loc2buf, PrintMessage, FinalizeMessageBegin and FinalizeMessage.
  ○ Refactor CTIerrorBegin/Continued/End.
    - Refactored calling locations to properly make use of these functions.
  ○ Remove CTIwarnContinued (Had no uses and CTIwarnBegin/End did not yet exist).
  ○ Add CTIerrorRaw as a companion function to CTIgetErrorMessageVA.
    - Refactored calling locations of CTIgetErrorMessageVA to use CTIerrorRaw when printing output.
• Add sac2cShared as a dependency for base-test-environment to avoid linking before types_nodetype.h is generated.
• Add SBUFprintd function variant that deallocates the string argument.
• Fix TYextendBottomError adding a newline if the error message to concatenate is null.
• Refactor errors in type_errors.c to make use of str_buffer.h.
  - This also fixes two memory leaks.
• Remove all sources of '@' characters in strings where they were used as newlines.
• Refactor all sinks of '@' characters to instead consume newlines.
  ○ An exception is in ctformatting.c, because the source of the @ character is a compiler argument and cannot generate newlines.
• Remove outdated README from the tests/errors folder (An updated README exists in the tests folder).
• Refactor error end-to-end tests.
  ○ Add Mac compatibility - the tests no longer make use of the -P flag which BSD grep does not support.
  ○ Remove the case insensitive flags.
• Rename test-type_inference_error.sac to test-type-inference-error.sac.
• Rename test-overload_error.sac to test-overload-error.sac.
• Rename function CTFvcreateMessageLoc to CTFvCreateMessageLoc.

• Fix a warning for cti-single-line being issued when it should not, and vice versa.

• Changed all mentions of unit tests to end-to-end tests.
• Document how to reuse program output to run multiple checks on it.
• Document how to use run.sh for an entire folder at once.
• Miscellaneous improvements.

• CTFcreateMessageContinued can now be called without providing the multiline header.
• The 'current' multiline header is stored as a static variable in ctformatting.c.
• The functions CTFcreateMessage(Begin)(Loc) assign the multiline header.
• CTFcreateMessageEnd frees the multiline header and sets it to NULL.
• The CTFcreateMessageBegin functions call CTFcreateMessageContinued to parse remaining_lines instead of returning them unparsed.
• Updated tests for the changed behaviour.

• Fix wrong calls to CTIabort
• Potential fix to ignore -Wformat-zero-length in a few test cases.

• Runtime unit-tests (cuda/hwloc) are broken because of linking errors.
• Main.c now calls CTFinitialize.

• Fix @ being replaced with newlines in the multiline header.
• Fix @ being replaced with spaces instead of a newline in the first line header if cti-single-line is disabled.
• Add tests for replacing @ with \n or a space for the first line header.

In the previous commit, static const globals were defined in ctformatting.c, alongside getter functions.
The getters are not allowed, and lead to a hang.
The fix is to instead define the globals in the header file as macros.