Add new "last updated date" settings

-Added new configurable settings to allow displaying a "last updated date" timestamp for: index, reward, masternode, movement, network, richlist and market pages
-Affected pages are now configured to be completely hidden and disabled when their display settings are set to false

views/richlist.pug

@@ -1,6 +1,7 @@
 extends layout
 
 block content
+  include ./includes/common.pug
   if show_dist == true
     script.
       $(document).ready(function() {
@@ -34,6 +35,9 @@ block content
   .row(style='margin-left:0;margin-right:0;')
     div(class=(show_dist == true ? 'col-xs-12 col-lg-8' : 'col-12'))
       .container
+        if settings.richlist_page.show_last_updated == true
+          div.font-weight-bold(style='margin-bottom:15px;') Top 100 data last updated:
+            span.font-weight-normal=(last_updated == null || last_updated == '0' ? ' N/A' : ' ' + format_unixtime(last_updated))
         ul.nav.nav-tabs(role='tablist')
           li.nav-item(role='presentation')
             a.nav-link.active(href='#balance', aria-controls='balance', role='tab', data-toggle='tab') #{settings.locale.rl_current_balance}