To hold the common logic of detecting pagination, forming the key, and
splitting its values later on.
I can take advantage that a form with action="get" already adds its
fields to the query string to have a common template for pagination. The
only problem is that i have different column spans for different tables,
therefore had to add a colspan to the struct.
It is just the index of bookings in the created state, but we thought it
would make easier to understand the difference between a booking from
a customer not yet confirmed, from a booking confirmed or created by the
staff.
