Add the lane information to the Task model.
Drop the foreign key constraint on the user_uid in the task log, as we might create tasks for users before they ever log into the system.
Add a new endpoint to the API called task events. It should be possible to query this and get a list of all tasks that need a users attention.
The task events returned include detailed information about the workflow and study as sub-models
Rename all the actions in event log to things that are easier to pass over the api as arguments, make this backwards compatible, updating existing names in the database via the migration.
Throughly test the navigation and task details as control of the workflow is passed between two lanes.
* The Task.title returned to the front end will now attempt to process the "display_name" property for dot-notation syntax, making it possible to use this for multi-instance tasks,
but will work in all cases where we want he title to change based on values in the data model.
* Fixing a bug the test_study_api where it wasn't updated when we made recent changes to the different states of a study.
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