Add "Load more" style pagination

[Decipher]

Is your feature request related to a problem? Please describe.
As a user I want the ability to "load more"/append results onto a View page instead of changing the Page of results.

Describe the solution you'd like

• Add a "load more" pager option?
• Add option for how many items to append (may be different from from Drupal View pagination settings).

Describe alternatives you've considered
N/A

Additional context
Drupal Views have a "More" option that could be used as the configuration for this functionality:

[BrianGilbert]

Would it be viable to add a form alter in the Druxt module that added a checkbox to show more link on the primary page view, just in case there is a case where a user wouldn't want a more link in the linking display and the page view?

[Decipher]

I'm not sure that that is necessary. There is already the ability to choose the Display that the "more link" applies to via the Drupal Views.