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/features/FeatureManager.kt

@@ -0,0 +1,36 @@
+package moe.nea.notenoughupdates.features
+
+import kotlinx.serialization.serializer
+import moe.nea.notenoughupdates.NotEnoughUpdates
+import moe.nea.notenoughupdates.features.world.FairySouls
+import moe.nea.notenoughupdates.util.ConfigHolder
+
+object FeatureManager : ConfigHolder<FeatureManager.Config>(serializer(), "features", ::Config) {
+    data class Config(
+        val enabledFeatures: MutableMap<String, Boolean> = mutableMapOf()
+    )
+
+    private val features = mutableMapOf<String, NEUFeature>()
+
+    fun autoload() {
+        loadFeature(FairySouls)
+    }
+
+    fun loadFeature(feature: NEUFeature) {
+        if (feature.identifier in features) {
+            NotEnoughUpdates.logger.error("Double registering feature ${feature.identifier}. Ignoring second instance $feature")
+            return
+        }
+        features[feature.identifier] = feature
+    }
+
+    fun isEnabled(identifier: String): Boolean? =
+        config.enabledFeatures[identifier]
+
+
+    fun setEnabled(identifier: String, value: Boolean) {
+        config.enabledFeatures[identifier] = value
+        markDirty()
+    }
+
+}