update free filter node selection and deletion to better support ios. add enable toggles for free filter and ratio in tabs. on ios shutdown audio when going to background and not doing anything. some layout fixes

Source/jcdp_envelope.h

@@ -390,6 +390,13 @@ public:
         if (indx>(int)m_nodes.size()-1) i=(int)m_nodes.size()-1;
         m_nodes[i].Status=nstatus;
     }
+    void SetNodeStatusForAll(int nstatus)
+    {
+        for (int i=0; i < m_nodes.size(); ++i) {
+            m_nodes[i].Status = nstatus;
+        }
+    }
+
     void SetNode(int indx, envelope_point anode)
     {
         int i=indx;