Fixes#9923.
These are no longer used because we now use kmc for builds. This also
means that the kmcomp-x64-structures test is no longer required, because
that was used to keep the Delphi and C++ structures in sync.
There are some minor details around error message identifiers that are
still present in a handful of places, but they are work for another
time.
Relates to #8493.
* Removes kmcmplib calls from kmcmpdll (now that we have kmc)
* Removes old kmcmp_CompileKeyboardFile and
kmcmp_CompileKeyboardFileToBuffer functions in preference for a much
cleaner kmcmp_CompileKeyboard function
* Removes json validation helper from kmcmplib (we'll use js-native
json schema validation instead)
This change means that we no longer need to keep compfile.h consistent
between kmcmplib and kmcmpdll. This will simplify upcoming refactoring
of kmcmplib.
kmcmplib no longer writes files, but it does still read them. The next
refactor will move file load responsibility into the caller.
