On macOS /var is a symlink to /private/var and we have to make sure that we
use the canonical path before and after it enters the code to make sure we
compare paths correctly.
Remove all configure_files:
- Move all tests to cpp files
- Use the QTEST_MAIN macro instead of a generated main.cpp
- Include test*.moc in the cpp to let CMAKE_AUTOMOC call moc
- Pass info through add_definitions instead of generating oc_bin.h with them
This makes sure that build errors points to the original test source
file instead of the generated one in the build directory to be able to
jump and fix errors directly from the IDE's error pane.
