Move to option args and streamline interface.

Move to option style arguments using cmake_parse_arguments and
remove verapp_profile_check_sources_conformance_for_target. That function
does the same stampfile generation as common-universal-cmake, but nobody
actually uses it. Users should use common-universal-cmake instead.
Merge pull request #21 from smspillaz/veracpp-cmake.item_21

Move to option args and streamline interface.