Use default views instead of hard coded listing pages

Thanks for opening this issue, I've been thinking about doing this in the 4.x branch, though it will mean that Views (and CTools) become a dependency for Webform. I don't think that's a problem, especially with the majority of both modules built into Drupal 8 core.

Although it's an issue to follow-up on this one, I'd like end-users to be able to add/remove columns for components for individual webform listing pages. The main submissions listing page just isn't very helpful showing usernames for example if only anonymous users fill out the forms. I imagine this would be implemented as a special field type in Views, but I haven't figured out exactly how that would work yet.

This relates to #1589582: Add checkbox on the webform result page so user can select multiple result and delete them (Views Bulk Operation style) pretty heavily also.

I think a good first step is simply requiring CTools and Views as dependencies for Webform 4.x, even if we're not using them yet. That enables us to add these pages as views later.

I would think that this brilliant move would also open the door for the much desired ability to "score" webform results.

For example, with a series of true/false questions the total number of true responses could now easily be added up using Views calculate function.

There are TONS of other applications coming to mind related to this functionality.

Although I'm sad the effect this has on the modules page (lots more module dependencies being listed), I think making Webform depend on Views is the right move and it will enable us to convert listings later. So for now I've committed this patch as a stop-gap to allow us to move to a final release and convert listings to Views later.

#5 needs porting to 8.x-4.x.

Committed and pushed to 8.x-4.x.

Moving back to Active as the dependency is only the first step here.

Even though this is the older issue, there is more discussion about removing hard-coded tables in the related issue.