[CMake] lists without semicolons

[Brandon Van Every]

I have found the results of STRING(REGEX MATCHALL ...) to be useless
in practice, because generally I'm operating on a file as my input
stream, and the file typically contains semicolons.   I would like
lists that are safe with respect to string operations, that are not
simply strings delimited by semicolons.  Is it feasible to
re-implement CMake with such lists?  Or is this primitive way too
deeply entwined in the implementation?

Cheers,
Brandon Van Every