emit proposal_create event for amendments
create amendment event types
emit amendment events
add amendment event icon
define amendment.selection even if selection is deleted

Without this, entity_url on a deleted amendment will fail

As amendments always have one single selection and are
below that in the hierarchy I guess it is reasonable
to keep the selection around even if it is deleted.
amendment event dashboard preview
Merge pull request #616 from xi/feature-amendment-events

amendment events