Added support for compositor tests. Compositor tests can be added, executed and viewed in a similar way to cycles
and other render engines tests.
Running test:
`ctest -R compositor`
Updating test:
`BLENDER_TEST_UPDATE=1 ctest -R compositor`
Viewing test results:
typically saved under `build_folder/tests/compositor/report.html`
{F9877067}
Attached `compositor.zip` must be extracted to `lib/tests`.A successful run should produce a report like the following:
{F8928443}