Adds isExpired method in events.

quartz/src/main/java/com/vitorpamplona/quartz/events/Event.kt

@@ -126,6 +126,8 @@ open class Event(
         null
     }
 
+    override fun isExpired() = (expiration() ?: Long.MAX_VALUE) < TimeUtils.now()
+
     override fun getTagOfAddressableKind(kind: Int): ATag? {
         val kindStr = kind.toString()
         val aTag = tags

quartz/src/main/java/com/vitorpamplona/quartz/events/EventInterface.kt

@@ -70,4 +70,5 @@ interface EventInterface {
 
     fun taggedEmojis(): List<EmojiUrl>
     fun matchTag1With(text: String): Boolean
+    fun isExpired(): Boolean
 }