Refactor source layout

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

[no changelog]

src/main/kotlin/events/ModifyChatEvent.kt

@@ -0,0 +1,21 @@
+
+
+package moe.nea.firmament.events
+
+import moe.nea.firmament.util.unformattedString
+import net.minecraft.text.Text
+
+/**
+ * Allow modification of a chat message before it is sent off to the user. Intended for display purposes.
+ */
+data class ModifyChatEvent(val originalText: Text) : FirmamentEvent() {
+    var unformattedString = originalText.unformattedString
+        private set
+    var replaceWith: Text = originalText
+        set(value) {
+            field = value
+            unformattedString = value.unformattedString
+        }
+
+    companion object : FirmamentEventBus<ModifyChatEvent>()
+}