Add willMatchEveryThing as a static replacement for matchesAnything

app/Rules/Triggers/TriggerInterface.php

@@ -28,6 +28,24 @@ interface TriggerInterface
      */
     public function __construct(RuleTrigger $trigger, TransactionJournal $journal);
 
+    /**
+     * A trigger is said to "match anything", or match any given transaction,
+     * when the trigger value is very vague or has no restrictions. Easy examples
+     * are the "AmountMore"-trigger combined with an amount of 0: any given transaction
+     * has an amount of more than zero! Other examples are all the "Description"-triggers
+     * which have hard time handling empty trigger values such as "" or "*" (wild cards).
+     *
+     * If the user tries to create such a trigger, this method MUST return true so Firefly III
+     * can stop the storing / updating the trigger. If the trigger is in any way restrictive
+     * (even if it will still include 99.9% of the users transactions), this method MUST return
+     * false.
+     *
+     * @param null $value
+     *
+     * @return bool
+     */
+    public static function willMatchEverything($value = null);
+
     /**
      * A trigger is said to "match anything", or match any given transaction,
      * when the trigger value is very vague or has no restrictions. Easy examples