ctests: allow excluding patterns

ctests: allow excluding patterns

This allows us to exclude matches of certain patterns in
invertedTests, ignoredTests, unreliableTests, and suspendedTests.

To use this new functionality, prefix "!" to the pattern.

This functionality serves as a workaround in some cases to not being
able to use advanced regular expression techniques, such as
"negative lookahead", with CMake's regular expression engine.

Output of "ctest -N" is unchanged by this commit.

This functionality will be used soon (see next commits).

Patch from Kornel Benko.