Added form buttons to the top of the form
Added discount amount field
added return quantity of  slot and sub slots
Added getBookingAmount function
Added default form value if the action is close
Set defaulf amounts for cancellation form
fixed Notice: Undefined variable: defaults when no contribution record
using date picker for event cancellation date
using text for displaying total amount instead of pain text
Added function getBookingAdhocCharges
return quantity when getting slots and sub slots
fixed secondary_contact_id undefied notification
Added total_amount to booking entity
Added total_amount to booking table when create the table
getting values to display on selector screen.
updated the variable names when rendering booking