Remove unused method
Provide data needed for filter configuration via gon
Add readable names to available work package filters
Restrict API access to work package details to visible work packages
Add accidentally deleted method for moving columns
Add query view model providing basic query filter API
Sketch angular query filters
Remember values throughout switching the operators
Rename work package table filters
Only list filters that haven't been selected as addable
Enable filter deactivation
Add angular validations to text fields
Remove former query form from work_packages#index
Add filter view model
Reload and filter data when filters are modified (WIP)
Wired up select/multiselect toggle button.
Remove filter icons have link cursor.
Fixed js error when zero work packages are returned.
Added angular date picker directive. Not actually using it.

Current filters don't require it, but we might want to use it in the future.
Moved toggled multi select into its own directive.