Add contacts, rework comms schema

This in a pretty huge change. At a high level we're adding the concept
of a 'contact' which is a person or organization that has zero or more
contact methods (email, phone). This ended up cascading a number of
changes, including critically to the publicreprt schema. In the end it
seemed safer to get to the point where I'm confident we aren't using any
of the old fields for storing reporter information (though I haven't
deleted the columns yet) so I removed the code for defining those
columns.

At this point I think it's not possible for me to regenerate the bob
schema due to the interdependencies between my various schemas, so the
migration is well-and-truly happening.

platform/types/contact.go

@@ -10,7 +10,7 @@ type Contact struct {
 	Email    *string `db:"email" json:"email"`
 	HasEmail bool    `json:"has_email"`
 	HasPhone bool    `json:"has_phone"`
-	Name     *string `db:"name" json:"name"`
+	Name     string  `db:"name" json:"name"`
 	Phone    *string `db:"phone" json:"phone"`
 }
 

platform/types/site.go

@@ -40,7 +40,7 @@ func SiteFromModel(s *models.Site) Site {
 		Notes:          s.Notes,
 		OrganizationID: s.OrganizationID,
 		Owner: Contact{
-			Name:  &s.OwnerName,
+			Name:  s.OwnerName,
 			Phone: &owner_phone,
 		},
 		ResidentOwned: resident_owned,