Move Eventhandling around.

I still want to use fabric still "array backed" events, but these here are just a bit easier to use from kotlin.

src/main/kotlin/moe/nea/notenoughupdates/events/NEUEventBus.kt

@@ -0,0 +1,26 @@
+package moe.nea.notenoughupdates.events
+
+import java.util.concurrent.CopyOnWriteArrayList
+
+open class NEUEventBus<T : NEUEvent> {
+    data class Handler<T>(val invocation: (T) -> Unit, val receivesCancelled: Boolean)
+
+    private val toHandle: MutableList<Handler<T>> = CopyOnWriteArrayList()
+    fun subscribe(handle: (T) -> Unit) {
+        subscribe(handle, false)
+    }
+
+    fun subscribe(handle: (T) -> Unit, receivesCancelled: Boolean) {
+        toHandle.add(Handler(handle, receivesCancelled))
+    }
+
+    fun publish(event: T): T {
+        for (function in toHandle) {
+            if (function.receivesCancelled || event !is NEUEvent.Cancellable || !event.cancelled) {
+                function.invocation(event)
+            }
+        }
+        return event
+    }
+
+}