Add API methods for controlling audio

Hook up Update() callback
Add Audio QOL plugin with mute/unmute hotkey and better settings persistence

plugin-playground/src/main/kotlin/AudioQOL/plugin.kt

@@ -0,0 +1,67 @@
+package AudioQOL
+
+import plugin.Plugin
+import plugin.annotations.PluginMeta
+import plugin.api.API
+import plugin.api.FontColor
+import plugin.api.FontType
+import plugin.api.TextModifier
+import rt4.Keyboard
+import java.awt.event.KeyAdapter
+import java.awt.event.KeyEvent
+
+@PluginMeta(
+    author = "Ceikry",
+    description = "Provides some QOL for audio, including better settings persistence",
+    version = 1.0
+)
+class plugin : Plugin() {
+    var isMute = false
+    var lastVolumes: Triple<Int,Int,Int>? = null
+
+    override fun Update() {
+        if (isMute) return
+        API.StoreData("sound-vol", API.GetSoundVolume())
+        API.StoreData("music-vol", API.GetMusicVolume())
+        API.StoreData("amb-vol", API.GetAmbientVolume())
+    }
+
+    override fun Init() {
+        val soundVol = API.GetData("sound-vol") as? Int ?: 255
+        val musicVol = API.GetData("music-vol") as? Int ?: 127
+        val ambVol = API.GetData("amb-vol") as? Int ?: 127
+        API.SetMusicVolume(soundVol)
+        API.SetAmbientVolume(musicVol)
+        API.SetSoundVolume(ambVol)
+
+        API.AddKeyboardListener(object : KeyAdapter() {
+            override fun keyPressed(e: KeyEvent) {
+                if (API.IsKeyPressed(Keyboard.KEY_CTRL) && e.keyCode == KeyEvent.VK_M) {
+                    toggleMute()
+                }
+            }
+        })
+    }
+
+    private fun toggleMute() {
+        isMute = !isMute
+        if (isMute) {
+            lastVolumes = Triple(API.GetMusicVolume(), API.GetSoundVolume(), API.GetAmbientVolume())
+            API.SetMusicVolume(0)
+            API.SetSoundVolume(0)
+            API.SetAmbientVolume(0)
+            API.SendMessage("Audio Muted.")
+            if (API.IsMusicPlaying()) {
+                API.PlayMusic(0, -1)
+            }
+        } else {
+            API.SetMusicVolume(lastVolumes?.first ?: 255)
+            API.SetSoundVolume(lastVolumes?.second ?: 127)
+            API.SetAmbientVolume(lastVolumes?.third ?: 127)
+            API.SendMessage("Audio Unmuted.")
+            if ((lastVolumes?.first ?: 255) > 0) {
+                API.RequestNewSong()
+            }
+        }
+    }
+}