This patch also disables the ability to specify deps when creating a ticket,
because those deps won't be in the ticket object anymore. Instead of coding a
workaround and getting complications later, I just disabled that thing. It
wasn't really being used by anyone anyway.
This patch doesn't just add the handler code, it also does lots of refactoring
and moves around pieces of code that are used in multiple places. There is
still lots of refactoring to make though. In this patch I tried to make minimal
changes to the existing Note handler to avoid breaking it. In later patches
I'll do some more serious refactoring, hopefully resulting with less mess in
the code.
