Modernize Conpherence with Modular Transactions

Summary: Begin converting Conpherence to ModularTransactions, this converts title, topic, and picture to use modular transactions. Participants seems hairy so I'll do that in another diff

Test Plan: Create a room with a topic, change room name, topic. Add people, remove people. Set a room image. Unset topic.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17668

src/applications/conpherence/controller/ConpherenceUpdateController.php

@@ -140,10 +140,12 @@ final class ConpherenceUpdateController
           $title = $request->getStr('title');
           $topic = $request->getStr('topic');
           $xactions[] = id(new ConpherenceTransaction())
-            ->setTransactionType(ConpherenceTransaction::TYPE_TITLE)
+            ->setTransactionType(
+              ConpherenceThreadTitleTransaction::TRANSACTIONTYPE)
             ->setNewValue($title);
           $xactions[] = id(new ConpherenceTransaction())
-            ->setTransactionType(ConpherenceTransaction::TYPE_TOPIC)
+            ->setTransactionType(
+              ConpherenceThreadTopicTransaction::TRANSACTIONTYPE)
             ->setNewValue($topic);
           $xactions[] = id(new ConpherenceTransaction())
             ->setTransactionType(PhabricatorTransactions::TYPE_VIEW_POLICY)