Create envelope factory functions

modules/synth/src/main/kotlin/io/smnp/ext/SynthModule.kt

@@ -7,9 +7,11 @@ import io.smnp.ext.synth.Synthesizer
 import org.pf4j.Extension
 
 @Extension
-class SynthModule : NativeModuleProvider("smnp.audio.synth") {
+class SynthModule : HybridModuleProvider("smnp.audio.synth") {
    override fun functions() = listOf(WaveFunction(), SynthFunction())
 
+   override fun files() = listOf("envelope.mus")
+
    override fun onModuleLoad(environment: Environment) {
       Synthesizer.init()
    }

modules/synth/src/main/resources/envelope.mus

@@ -0,0 +1,13 @@
+function adsr(p1: float = 0.1, p2: float = 0.3, p3: float = 0.8, s: float = 0.8) {
+    return {
+        name -> "adsr",
+        p1 -> p1,
+        p2 -> p2,
+        p3 -> p3,
+        s -> s
+    };
+}
+
+function constant() {
+    return { name -> "const" };
+}