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/reward.pug

@@ -1,6 +1,7 @@
 extends layout
 
 block content
+  include ./includes/common.pug
   script.
     $(document).ready(function() {
       $('.summary-table').dataTable({
@@ -17,6 +18,9 @@ block content
     });
   .row(style='margin-left:0;margin-right:0;')
     .col-xs-12.col-md-12
+      if settings.reward_page.show_last_updated == true
+        div.font-weight-bold(style='margin-bottom:15px;') Reward data last updated:
+          span.font-weight-normal=(last_updated == null || last_updated == '0' ? ' N/A' : ' ' + format_unixtime(last_updated))
       .card.card-default.border-0.card-address-summary
         .card-header(style='position:relative;')
           strong #{settings.locale.heavy_title}