• Move the default header formats from ctinfo.c to ctformatting.c
  ○ The getDefault functions now return a const reference to the default header.
• Move option consistency check for cti globals to ctformatting with CTFinitialize.
• Fix the test from last commit that was broken.
• Various improvements or tiny fixes to ctformatting.c

• Add CTFcheckHeaderConsistency to ctformatting.
• Add default headers to ctinfo and methods to retrieve copies of said headers.
• Set the default headers as default headers in globals.mac
• Add header consistency checks to OPTcheckOptionConsistency in options.c
  ○ Add warnings for conflicting cti settings.
• Add broken test to test-compile-time-formatting.cpp for CTFcreateMessageLoc.

• Add new files ctformatting.c, ctformatting.h and add them to CMakeLists.
• Add a rewrite of the ProcessMessage, loc2buf, and CTIfinalize functions to ctformatting.c.
  ○ Tests pending.
  ○ The functions are still present in ctinfo.c
• Add SBUFtruncate, SBUFinsertAfterToken, and related tests.
• Add != null debug asserts for all pointer arguments for SBUF functions.
• Add minor improvements to ctinfo.c

• Removed the location-warning test since other commits made the scenario produce an error instead of a warning.

• CTInote still uses two spaces as a header when not given a location.
• CTInote uses headers like CTIwarn/error/abort when given a location.
• All CTInoteLine callers now call CTInote and use NODE_LOCATION instead of NODE_LINE.
• LINE_TO_LOC now has brackets around the argument.
• Remove unused functions in CTinfo.c

• Remove message_line_length, set_message_length(), CTIgetErrorMessageLength() and CTIgetWarnMessageLength() from ctinfo.

• All CTIwarnLine callers have LINE_TO_LOC applied to their first argument.
• CTIwarnLoc will be converted to make use of CTIwarn in the next commit.

• All CTIwarn callers have EMPTY_LOC inserted as their first argument.
• CTIwarnLine/Loc will be converted to make use of CTIwarn in the coming two commits.

• All CTIabortLine callers have LINE_TO_LOC applied to their first argument.
• Callers with NODE_LINE have been changed to use NODE_LOCATION.
• CTIabortLoc will be converted to make use of CTIabort in the next commit.

• All CTIabort callers have EMPTY_LOC inserted as their first argument.
• CTIabortLine/Loc will be converted to make use of CTIabort in the coming two commits.

• CTIabort-Line/Loc will be converted to make use of CTIabort in the next commits.

• All CTIerrorLine callers have LINE_TO_LOC applied to their first argument.
• CTIerrorLoc will be converted to make use of CTIerror in the next commit.

• All CTIerror callers have EMPTY_LOC inserted as their first argument.
• CTIerrorLine/Loc will be converted to make use of CTIerror in the coming two commits.

• Fix double free errors in CTIcreateMessage-Line/Loc

• CTIerrorBasic will end up replacing CTIerror and its sibling variants. They are kept for now to keep the code running.

This reverts commit 08699a1d.

• CTIerrorContinued remains broken for cti-single-line.
• cti-message-length should fully work now but there are no automated tests for it yet.

• Change usage descriptions.
• Fix CTIgetErrorMessageVA.
• Break CTIerrorContinued - uses indents instead of cti-multi-line-format.

• Change default arguments for cti-header-format and cti-multiline-format in globals.mac
• Add consistency warning for when -cti-single-line is enabled and -cti-message-line-length != 0
• Fix failing to parse format strings in errors
• Fix incorrect documentation in str.c
• Break CTIgetErrorMessageVA - the format now differs from the rest.

This reverts commit f863830c.

In the old system, warning messages were obtained in the format of `warning: <first line of warning_message>`.

In the new system, warning messages are displayed on lines that follow lines containing nothing but "Warning:".  
The first grep setup grabs the warnings and the line after each warning. The first lines containing "Warning:" are then removed by the second grep. The third grep now greps on the first line of the warning message prefixed by two spaces, which should be close enough to the original behaviour.