* Replace FAMs with `std::vector`s (or one `std::string`) in four `struct`s
* Anonymous types declared in an anonymous union are also non-standard
Only Clang complains about this (-Wnested-anon-types)
* Fixes from temporarily re-enabling more compiler warnings
* More edits suggested by cppcheck
* Fix hanging on append_yylval_string
* Fix FOR loop increment
Notable side effects:
* Use the standard-conformant MSVC preproc
* Add test for linker script INCLUDE
* Improve wording of placement conflict errors
* Fix errors from not newline-terminated files
* Teach checkdiff about the linker script doc
* Call linker script "commands" "directives" instead
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Co-authored-by: Rangi42 <remy.oukaour+rangi42@gmail.com>