Update form styles, implement in many places

Summary:
This creates a common form look and feel across the site. I spent a bit of time working out a number of kinks in our various renderings. Some things:

- Font Styles are correctly applied for form elements now.
- Everything lines up!
- Selects are larger, easier to read, interact.
- Inputs have been squared.
- Consistant CSS applied glow (try it!)
- Improved Mobile Responsiveness
- CSS applied to all form elements, not just Aphront
- Many other minor tweaks.

I tried to hit as many high profile forms as possible in an effort to increase consistency. Stopped for now and will follow up after this lands. I know Evan is not a super fan of the glow, but after working with it for a week, it's way cleaner and responsive than the OS controls. Give it a try.

Test Plan: Tested many applications, forms, mobile and tablet.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D5860

src/applications/maniphest/controller/ManiphestTaskEditController.php

@@ -355,6 +355,7 @@ final class ManiphestTaskEditController extends ManiphestController {
     $project_tokenizer_id = celerity_generate_unique_node_id();
 
     $form = new AphrontFormView();
+    $form->setFlexible(true);
     $form
       ->setUser($user)
       ->setAction($request->getRequestURI()->getPath())
@@ -499,11 +500,6 @@ final class ManiphestTaskEditController extends ManiphestController {
           ->addCancelButton($cancel_uri)
           ->setValue($button_name));
 
-    $panel = new AphrontPanelView();
-    $panel->setWidth(AphrontPanelView::WIDTH_FULL);
-    $panel->setHeader($header_name);
-    $panel->appendChild($form);
-    $panel->setNoBackground();
     $inst1 = pht('Description Preview');
     $inst2 = pht('Loading preview...');
 
@@ -550,7 +546,7 @@ final class ManiphestTaskEditController extends ManiphestController {
       array(
         $crumbs,
         $error_view,
-        $panel,
+        $form,
         $description_preview_panel,
       ),
       array(