Check in code that picksome/collection are loaded in the right order

Part of the code review for #78: refactoring ansible.

See https://github.com/OpenTechStrategies/torque-sites/pull/78#discussion_r517520952
for more information.

roles/collection/templates/collection.php.j2

 <?php
 require_once "$IP/extensions/Collection/Collection.php";
+
+if(isset($wgPickSomeLoaded)) {
+  echo "PickSome Loaded before Collection, so bombing out";
+  throw new RunTimeException("Collection being loaded after PickSome");
+}
 $wgCollectionMWServeURL = "http://127.0.0.1:8899";
 $wgCollectionMaxArticles = 250;
 $wgEnableApi = true;

roles/picksome/files/picksome.php

@@ -10,6 +10,11 @@
 # directly when loaded by LocalSettings (as opposed to in extension.json), overriding
 # the normal way mediawiki loads things.
 $wgHooks['SidebarBeforeOutput'][] = 'PickSomeHooks::onSidebarBeforeOutput';
+
+# And then, because we want to check in the Collection loadup config that
+# picksome was not loaded, we include a global here
+$wgPickSomeLoaded = true;
+
 wfLoadExtension('PickSome');
 $wgPickSomeNumberOfPicks = 15;