validate repository responses against JSON schemas
fix URL construction when downloading definitions from Hydrilla
make "uuid" an optional property
automatically pick up a free port to run the HTTP proxy on
It is now possible to run multiple make test commands in parallel (e.g. testing abrowser and librewolf simultaneously after running configure for each of them in 2 different directories).
make test
configure
fix test-environment* targets
fix out-of-source builds