Move member/watch actions to "Members/Watchers" page

Summary:
Ref T10054. This tries to make the members page a bit more consistent and provide hints to users about subproject/milestone membership rules. In particular:

  - You now join, leave, watch, unwatch, add and remove members, and lock and unlock membership from the members screen.
  - We now explain the membership rule for the project on this screen. There are currently four rules:
    - Normal Project: Join/leave normally.
    - Parent Project: Uses subprojects to determine members.
    - Milestone: Uses parent project to determine members.
    - Locked: Membership is locked.
    - (Future) Imported from LDAP/other external sources: Membership is determined by something else.

Test Plan: {F1064878}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10054

Differential Revision: https://secure.phabricator.com/D15059

src/applications/project/controller/PhabricatorProjectWatchController.php

@@ -18,9 +18,9 @@ final class PhabricatorProjectWatchController
       return new Aphront404Response();
     }
 
-    $project_uri = $this->getApplicationURI('profile/'.$project->getID().'/');
+    $done_uri = "/project/members/{$id}/";
 
-    // You must be a member of a project to
+    // You must be a member of a project to watch it.
     if (!$project->isUserMember($viewer->getPHID())) {
       return new Aphront400Response();
     }
@@ -56,7 +56,7 @@ final class PhabricatorProjectWatchController
         ->setContinueOnMissingFields(true)
         ->applyTransactions($project, $xactions);
 
-      return id(new AphrontRedirectResponse())->setURI($project_uri);
+      return id(new AphrontRedirectResponse())->setURI($done_uri);
     }
 
     $dialog = null;
@@ -83,7 +83,7 @@ final class PhabricatorProjectWatchController
     return $this->newDialog()
       ->setTitle($title)
       ->appendParagraph($body)
-      ->addCancelButton($project_uri)
+      ->addCancelButton($done_uri)
       ->addSubmitButton($submit);
   }