Add collaborators for selected events and update price fields

added placeholder for description for a selected event.
added notes during redux action so that newly created notes are not removed from the ui.
add adminstrators and unit price for each event
add price for event and retrieve from select event feature
add admins and retrieve from select event feature
add ability to retrieve new inventory rows once added
reset storage location if no data is found
remove && flags so that failure does not raise a zero
only creators are able to add other collaborators
add extra text during create event field
prevent ui crashing if user has not created any event

earmuff-jam / mashed