Migrate functions to app package (#5106)

* Refactor and move session logic into app package

* Refactor email functions into the app package

* Refactor password update into app package

* Migrate user functions to app package

* Move team functions into app package

* Migrate channel functions into app package

* Pass SiteURL through to app functions

* Update based on feedback

api/team_test.go

@@ -191,7 +191,7 @@ func TestGetAllTeamListings(t *testing.T) {
 		}
 	}
 
-	UpdateUserRoles(user, model.ROLE_SYSTEM_ADMIN.Id)
+	app.UpdateUserRoles(user.Id, model.ROLE_SYSTEM_ADMIN.Id)
 
 	Client.Login(user.Email, "passwd1")
 	Client.SetTeamId(team.Id)
@@ -244,7 +244,7 @@ func TestTeamPermDelete(t *testing.T) {
 	c.RequestId = model.NewId()
 	c.IpAddress = "test"
 
-	err := PermanentDeleteTeam(team)
+	err := app.PermanentDeleteTeam(team)
 	if err != nil {
 		t.Fatal(err)
 	}