[IMP] Show currency in fields
[FIX] RegForm Angular: Section dialogs init
[REF] RegForm: Section dialog tpls renamed
[FIX] RegForm Angular: Field number subtotal
[FIX] RegForm Angular: Added BillableCtrl

* Fixed all fields and sections using billable-related options
* Moved billable-related functions to a controller
[MIN] RegForm: Code cleanup