Re-apply "Use standard CMake constructs to export the targets. (#260)" #739
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Additionally, I have attempted to clean up some CMake issues to make the package's build interface cleaner, in particular, avoiding polluting the parent directory's include path with our config.h file (if PCRE2 is being included as a subdirectory).
This re-adds changes from Theodore's commit
def175f, and partially reverts changes from Carlo's commit 92d56a1.
Fixes #115