Split paste create/edit and list views

Summary:
We have this hybrid "create / last few pastes" landing screen right now but I ~never use the list at the bottom and it makes the controller kind of complicated. I want to let you edit pastes too, and this generally simplifies things.

Also makes the textarea monospaced and cleans up the fork logic a bit.

Test Plan: Created, forked pastes. Viewed paste lists. Viewed pastes.

Reviewers: vrana, btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1690

Differential Revision: https://secure.phabricator.com/D3375

src/applications/paste/application/PhabricatorApplicationPaste.php

@@ -34,7 +34,7 @@ final class PhabricatorApplicationPaste extends PhabricatorApplication {
     return array(
       '/P(?P<id>\d+)' => 'PhabricatorPasteViewController',
       '/paste/' => array(
-        '' => 'PhabricatorPasteListController',
+        '' => 'PhabricatorPasteEditController',
         'filter/(?P<filter>\w+)/' => 'PhabricatorPasteListController',
       ),
     );