Client sound fix (dropping still has sound issues)

Cache now includes all music + sfx + sound (taken from revision 550)
Drop item handler - removed useless send audio

Client/src/main/java/org/runite/client/SignLinkAudioChannel.java

@@ -0,0 +1,42 @@
+package org.runite.client;
+import java.awt.Component;
+
+final class SignLinkAudioChannel extends AudioChannel {
+
+   private final int anInt2969;
+   private static Interface1 anInterface1_2970;
+
+
+   final int method2157() {
+      return anInterface1_2970.method2((byte)118, this.anInt2969);
+   }
+
+   final void write() {
+      anInterface1_2970.method6(this.anInt2969, this.samples);
+   }
+
+   final void init(Component var1) throws Exception {
+      anInterface1_2970.method5(Class21.sampleRate, (byte)-39, var1, AudioChannel.stereo);
+   }
+
+   final void flush() {
+      anInterface1_2970.method1(this.anInt2969, 28544);
+   }
+
+   SignLinkAudioChannel(Signlink var1, int var2) {
+      anInterface1_2970 = var1.method1446((byte)99);
+      this.anInt2969 = var2;
+   }
+
+   final void open(int var1) throws Exception {
+      if(var1 > 32768) {
+         throw new IllegalArgumentException();
+      } else {
+         anInterface1_2970.method3(this.anInt2969, 25349, var1);
+      }
+   }
+
+   final void close() {
+      anInterface1_2970.method4((byte)20, this.anInt2969);
+   }
+}