Refactor source layout

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

[no changelog]

src/main/kotlin/events/SkyblockServerUpdateEvent.kt

@@ -0,0 +1,15 @@
+
+
+package moe.nea.firmament.events
+
+import moe.nea.firmament.util.Locraw
+
+/**
+ * This event gets published whenever `/locraw` is queried and HyPixel returns a location different to the old one.
+ *
+ * **N.B.:** This event may get fired multiple times while on the server (for example, first to null, then to the
+ * correct location).
+ */
+data class SkyblockServerUpdateEvent(val oldLocraw: Locraw?, val newLocraw: Locraw?) : FirmamentEvent() {
+    companion object : FirmamentEventBus<SkyblockServerUpdateEvent>()
+}