fix: task filters: fix task filtering by attribute

Now, task filters have been migrated over to the new attribute
system. Tasks can be filtered by N attributes each with N possible
options.
fix: task list: add labels below task title for attributes

In the task list, you can now see a label for each attribute (mutliple
labels if the attribute support multi-select).
temp commit
temp commit 1
Implement batch set attribute for tasks

The user can now set any attribute of any number of tasks to any of the
attributes options from the task list.
Clean up toolbar code
Clean up routes, fix JSON array issue.

JSON arrays are now correctly send to the server.
Remove old println
Make coll-remove a bit more robust. Restart fix-attributes
Implement function to fix task attributes when saving an updated project