phabricator_format_timestamp => phabricator_datetime

Summary: make the change, kill the function.   be sure to get a good $user or
$viewer variable

Test Plan:
for each controller or view, look at it in the ui.   change timezone, refresh ui
and note change.   i did not test the OAuthSettingsPanelController; not sure how
to get to that badboy and i got a bit lazy

Maniphest Tasks: T222

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, btrahan, epriestley

Maniphest Tasks: T222

Differential Revision: 1166

src/__phutil_library_map__.php

@@ -736,7 +736,6 @@ phutil_register_library_map(array(
     'phabricator_date' => 'view/utils',
     'phabricator_datetime' => 'view/utils',
     'phabricator_format_relative_time' => 'view/utils',
-    'phabricator_format_timestamp' => 'view/utils',
     'phabricator_format_units_generic' => 'view/utils',
     'phabricator_render_form' => 'infrastructure/javelin/markup',
     'phabricator_time' => 'view/utils',