Lightning 8.x 4.x

[spotzero]

This PR updates to Lighting 4.0 with Drupal 8.7.1 and cleans up the patches.

[spotzero]

A note about the patches I modified:

• The first was merged into 8.7 (yah!)
• The second I updated with the newest version.
• The third has been closed as "Cannot reproduce" and the patch for 8.7 wasn't created correctly so it doesn't apply. The patch is in https://www.drupal.org/node/2914233. The comment from the core team was actually "won't fix" and they advised that the issue should be fixed in the templates having problems directly. I've removed that patch, but I haven't done sufficient testing on specifically that issue to see if what, if anything, remains to be fix.

[spotzero]

There is also some discussion about this here: https://www.drupal.org/project/wxt/issues/3049222

[spotzero]

Testing https://www.drupal.org/node/2914233 shows that it does not work. I'm looking into the suggested fix.

[spotzero]

2914233 should actually be fixed in panelizer. I've contributed here: https://www.drupal.org/project/panelizer/issues/2750491#comment-13111032

I'll add the patch into the composer file on this branch.

[spotzero]

Alright, the preview panelizer patch is in now.