LDEV-3292: Get rid of learner progress object juggling when compling an activity. It looked like there were several objects but all changes were done on the same one. It could also lead to two objects referencing the same row in DB which resulted in an exception while saving.
LDEV-3971: Remove pointless synchronisation from Java methods. It would not work in multi-node environment anyway. Focus on DB transactions. General clean up and formatting.
LDEV-3765: Add command websockets in all tools. Run check less often (5s vs 2s) as the effect does not need to be immediate. Reorganise code. Add i18n support.
