backend changes for having multiple select fields pull from api and have option of add button inline. Corresponding tests
Expose select values to the FE
Switch to hidden inputs from m2ms
Hidden field for empty m2m values
added data-multiple attr to m:m field
new functionality for many:many fields to add a new value

wip: sort options not toggling correctly
disabled sorting

was not fully functional, needs UX revisit
Merge branch 'm2madd' into develop
hint cleanup; compiled js