Added a few more workshift-related settings
Re-organized settings into sections by module
Don't ignore migrations, we'll need those!
Added warnings when saving shift edits
Moved note form below shifts forms
Added explanations of hours + hour adjustments
Replaced auto_assign and assignable with assignment, which allows for one of multiple assignment categories
Updated tests / forms / views to reflect this new attribute
Make more use of signals, generate instances on shift save
Whitespace changes
Use signals to delete workshift instances, too