Enable prefilling of projects and priority fields in Maniphest task creation

Summary:
Projects and priority inputs can be prefilled similar to how title
and description fields work.

Prefilling of projects already worked but used PHIDs instead of
more user friendly name so I changed that too.

Test Plan:
Visit [[/maniphest/task/create/?projects=Maniphest;Easy&priority=100&assign=vrana&title=Hip-hip&description=hooray!|example]]
and see prefilled form fields.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7394

src/applications/project/query/PhabricatorProjectQuery.php

@@ -7,6 +7,7 @@ final class PhabricatorProjectQuery
   private $phids;
   private $memberPHIDs;
   private $slugs;
+  private $names;
 
   private $status       = 'status-any';
   const STATUS_ANY      = 'status-any';
@@ -43,6 +44,11 @@ final class PhabricatorProjectQuery
     return $this;
   }
 
+  public function withNames(array $names) {
+    $this->names = $names;
+    return $this;
+  }
+
   public function needMembers($need_members) {
     $this->needMembers = $need_members;
     return $this;
@@ -224,6 +230,13 @@ final class PhabricatorProjectQuery
         $this->slugs);
     }
 
+    if ($this->names) {
+      $where[] = qsprintf(
+        $conn_r,
+        'name IN (%Ls)',
+        $this->names);
+    }
+
     $where[] = $this->buildPagingClause($conn_r);
 
     return $this->formatWhereClause($where);