Improve Views "Select all Pages" namespacing and options

[quicksketch]

Follow-up to the original issue to include a "Select all pages" option here: #3798

When merged, a lot of the naming of things had come over directly from the Views Bulk Operations (VBO) module. The naming of things could be improved to make them less derived from the contrib project and more integrated directly into Views.

[argiepiano]

Thanks. I did change all of the JS namespacing - 'bulk_form` is unique to core and will not collide if contrib's VBO is enabled. Same with css. It'd be good to know which "things" need to be renamed.

[quicksketch]

@argiepiano I'm going to take a stab at it, but generally I think we might rename "bulk_form" to "views_select_all_pages". One of the issues is that the current code doesn't prefix anything with "views_", which all theme functions and classes generally should do: follow the namespace of the parent module.

[argiepiano]

OK, sounds good.

[quicksketch]

PR filed at backdrop/backdrop#5185. @argiepiano, could you have a look at the general direction?

I tested on table and non-table views and it seems to keep everything working... but with this much renaming I likely missed something.