Make chat events use fabric events

[no changelog]

src/main/kotlin/moe/nea/firmament/events/ModifyChatEvent.kt

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Linnea Gräf <nea@nea.moe>
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+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>()
+}