Update CTools to 1.12 and Panels to 3.8

Updated issue summary to reflect new releases for Panels and CTools.

Attached is a patch to panopoly_core and an interdiff. This might require updating PHP versions, we'll see when the tests run.

The live preview test is failing consistently in the "Live preview should work when configuring a pane style" scenario, line 371 of livepreview.feature. See https://travis-ci.org/cboyden/panopoly/builds/168148433.

Live Preview is not firing when the radio button for the test style is selected:

When I select the radio button "Panopoly Test: Style with settings" with the id "edit-style-panopoly-test-settings-style"
And I wait for live preview to finish
Then I should see "This widget is patentedly awesome!" 
      The text "This widget is patentedly awesome!" was not found anywhere in the text of the current page. (Behat\Mink\Exception\ResponseTextException)

If you comment out the failing step, the rest of the test passes; the live preview updates successfully in the 2nd part of the test:

When I select "Terrible" from "Quality of this widget"
And I wait for live preview to finish
Then I should see "Avert your eyes! It's not even worth to cast your gaze upon this widget."

It's possible that live preview needs some adjustment in order to work with the new CTools.

The problem with live preview appears to be caused by the commit in this issue: #1823088: Autosubmit forms in modals are broken. There's a proposed patch in #2787045: Regression: Compatibility with Drupal 7 core version of jQuery broken which basically reverts the check for JQ version number and just does a strict === check for the string "undefined". Adding this patch to the CTools recipe allows the live preview test to pass.

Tests are passing, see https://travis-ci.org/cboyden/panopoly/builds/174070306.

CTools 1.12 is here! Updated patch is attached.

Tests are passing except for the expected failures due to the Apps bug post-7.50. See https://travis-ci.org/cboyden/panopoly/builds/184361350.

There's a critical regression in Panels 3.8 - see #2479879: Move 'panels_page_allowed_types' variable to a custom table.. Allowed types variables (that control what content can be added to Panels or Panelizer pages) are no longer exportable with Features. An update hook deletes existing variables. If any site using Panopoly has made changes to allowed types, and not exported them into code, they will lose data.

The patch from #2479879: Move 'panels_page_allowed_types' variable to a custom table. #33 doesn't solve the problem - it reverts the code so that allowed_types config is still stored as variables, but it doesn't revert the update hook that deletes the variables. I added a patch that changes the update hook so that all it does is add the new table. New patch for the panopoly_core makefile is attached.

EDIT: Tests are passing, see https://travis-ci.org/cboyden/panopoly/builds/193492410.