correctly load prices for new conference items on the pricing form
[fixes #57452088]
add languages to proposals
[fixes #57860930]
add drop out status for proposal reviews
[fixes #57860914]
add student discount notification
[fixes #57860794]
add remove presenter functionality to proposals
[fixes #57860710]
limit number of proposal presenters to 4
[fixes #57860704]
show transaction method on payment page
[fixes #57860890]
add av & projector requirements to review page
add av, projector, and format fields to unslotted proposals
[fixes #57860718]
add reports controller
add report for accepted proposals that have unregistered presenters
[fixes #57860562]
Merge pull request #1 from benedictfischer09/rel1.1

Rel1.1