Refactor source layout

Introduce compat source sets and move all kotlin sources to the main directory

[no changelog]

src/main/kotlin/features/FirmamentFeature.kt

@@ -0,0 +1,23 @@
+
+
+package moe.nea.firmament.features
+
+import moe.nea.firmament.events.subscription.SubscriptionOwner
+import moe.nea.firmament.gui.config.ManagedConfig
+
+// TODO: remove this entire feature system and revamp config
+interface FirmamentFeature : SubscriptionOwner {
+    val identifier: String
+    val defaultEnabled: Boolean
+        get() = true
+    var isEnabled: Boolean
+        get() = FeatureManager.isEnabled(identifier) ?: defaultEnabled
+        set(value) {
+            FeatureManager.setEnabled(identifier, value)
+        }
+    override val delegateFeature: FirmamentFeature
+        get() = this
+    val config: ManagedConfig? get() = null
+    fun onLoad() {}
+
+}