Draft: Feature/json schema writer

Adding JSON schema writer to GeneralContainer class

Note: This branch has been rebased onto fix/reference-overwrite so that the changes made there are included in the git history. If you have already pulled feature/json-schema-writer to your local computer, run these commands to pull in the changes:

git fetch
git checkout feature/json-schema-writer
git reset --hard origin/feature/json-schema-writer

which will update the local feature/json-schema-writer to the remote one