Handle the submission of the "New Hunt" modal

Handle the submission of the "New Hunt" modal

By creating a new entry in the hunts table.

As part of this change we rework turbot/views.py so that the block
functions it had are now in turbot/blocks.py (where they are usefully
shared). Meanwhile, the actual views that were being created are now
created above in events.py, actions.py, etc. where they can be
associated with functions to handle the submission of those views,
etc.