List: Bulk Edit Actions

[corsacca]

When using bulk edit action in the list view, there is a big list of fields to update.

Instead, let's make it a little more like the workflows UI. The user chooses a field and then chooses the value they want to set it to.
They can choose to add another field if they want.
We use a type ahead to select which field to add.

We also need the option to unset or clear the field. So we could set the connection field to empty. Remove all multi-select option, etc