[IMPROVED] User info pagination and filters

This will add pagination and user filters to the Admin Panel User
Information page.

* Added various filter methods (combined with AND in SQL)
* Added pagination and limits to fetch only matching users

This will greatly increase efficiency on larger pools

Fixes #1043 once merged.
[FIX] Removed old paginator
[ADDED] Pagination support on pool workers page

Adds pagination support for the admin panel pool workers page. Will
greatly increase loading times of this page if working as intended.

Fixes another part of #1043.
Merge pull request #1089 from TheSerapher/issue-1043

Issue 1043