add draggable filter conditions so they can be reordered easily in the list

[waqasbhatti]

also add at the bottom of the active filter conditions box, so it looks like:

Active filters




drag filters to change their order                        [add a (] [add a )]

We'll use https://github.com/RubaXa/Sortable for the draggable stuff. Need to figure out how to deal with the parens as well.

[waqasbhatti]

also change the value display in each filter card to a text box so it can be quickly changed