[IMPROVED] Adding customizable error page to MPOS

* `.htaccess` is used to re-define the error documents
* redirects to `index.php?page=error&action=<code>`
* does not work for MPOS inside subfolders yet

Addresses #734. If this works we can add this to all the other themes.
[FIX] Honor top share contributors limits
[FIX] Active worker count method

* Mmodified Query to properly return total active workers

Fixes #740 once merged.
pplns-stats, block-stats paging, dynamic and reverse payout
Merge pull request #746 from TheSerapher/issue-740

[FIX] Active worker count method
Merge pull request #747 from TheSerapher/issue-739

[FIX] Honor top share contributors limits
[IMPROVE] 404 handling

* [ADDED] Error/404 templates to mmcFE & mobile themes
* [IMPROVED] Make 404 default error with unknown page parameter
[FIX] Contirbutor detection

Fixes #745 once merged.
[FIX] Next attempt to fix #745
Revert "[FIX] Next attempt to fix #745"

This reverts commit d3d183cfe0cecbf69d49eb1d5c2f8be4537d5d86.
Merge pull request #748 from TheSerapher/issue-734

Issue 734
Merge pull request #749 from TheSerapher/issue-745

Issue 745
[FIX] Messed up getIdleWorkers name
Merge branch 'next' of github.com:TheSerapher/php-mpos into next
[IMPROVED] Look & Feel of basic Dashboard info

* [ADDED] Pool Workers live Update!
* [IMPROVED] PPLNS and PPS dashboard data
* [IMPROVED] Adjusted all dashboard to look alike
Merge pull request #750 from TheSerapher/dashboard-updates

[IMPROVED] Look & Feel of basic Dashboard info
round stats fixes
[IMPROVED] User real account name for contributor lists
[IMPROVED] Only display user contributions > 0
[FIX] Do not parse non-existing cache data, use SQL