Ajax pagination links should have a disabled state when they noop

[nacin]

Currently the first/previous/next/last pagination links will noop if you are on the first, only, or last page, as applicable.

This is confusing, as in order to know whether you're on the first, only, or last page, you have to look at one or two numbers (one of which is within an input) and compare them.

There should be some visual disabled state when you're on the first, only, or last page. I continually click one of them to expect an action, only to not have a spinner or anything, and it takes me a bit to realize why.

They should be devoid of :active, :hover, and their idle state should be a grayed out or washed out.

[garyc40]

duplicate #15503