Removed problematic cache from e107plugin::getinfo()

Every known usage of e107plugin::getinfo() requires up-to-date knowledge
of the involved plugin's record in the database.

For this reason, I removed the object scope global state caching of
results from e107plugin::getinfo()

Also changed the method name to a more descriptive getPluginRecord()

Also made e107plugin::getPluginRecord() static

e107_handlers/pref_class.php

@@ -845,7 +845,7 @@ final class e_core_pref extends e_pref
 		parent::__construct($pref_id, $pref_alias);
 		if($load && $pref_id)
 		{
-			$this->load();
+			$this->load($pref_id, $load);
 		}