Signed-off-by: Alexander Maznev <alexander.maznev@gmail.com>

olm_import_inbound_group_session, which reads the format written by
olm_export_inbound_group_session to initialise a group session.

I want to use test_olm.sh on jenkins, which lacks jq. Hence, add support to
olm.main to get id and one-time keys individually.

Split the python wrappers into separate modules