Adds an update method for changes in current Event

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/core/TagArrayBuilder.kt

@@ -60,6 +60,12 @@ class TagArrayBuilder<T : IEvent> {
         return this
     }
 
+    fun addFirst(tag: Array<String>): TagArrayBuilder<T> {
+        if (tag.isEmpty() || tag[0].isEmpty()) return this
+        tagList.getOrPut(tag[0], ::mutableListOf).add(0, tag)
+        return this
+    }
+
     fun addUnique(tag: Array<String>): TagArrayBuilder<T> {
         if (tag.isEmpty() || tag[0].isEmpty()) return this
         tagList[tag[0]] = mutableListOf(tag)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/nip01Core/signers/EventTemplate.kt

@@ -54,3 +54,8 @@ fun <T : Event> eventUpdate(
     createdAt: Long = TimeUtils.now(),
     updater: TagArrayBuilder<T>.() -> Unit = {},
 ) = EventTemplate<T>(createdAt, base.kind, base.tags.builder(updater), base.content)
+
+fun <T : Event> T.update(
+    createdAt: Long = TimeUtils.now(),
+    updater: TagArrayBuilder<T>.() -> Unit = {},
+) = eventUpdate(this, createdAt, updater)