Add a couple more modem methods for back compat

src/main/java/dan200/computercraft/shared/peripheral/modem/ModemPeripheral.java

@@ -39,6 +39,20 @@ public ModemState getModemState()
         return m_state;
     }
 
+    @Deprecated
+    public boolean pollChanged()
+    {
+        // Only for backwards compatibiliy
+        return m_state.pollChanged();
+    }
+
+    @Deprecated
+    public boolean isActive()
+    {
+        // Only for backwards compatibiliy
+        return m_state.isOpen();
+    }
+
     private synchronized void setNetwork( IPacketNetwork network )
     {
         if( m_network == network ) return;

src/main/java/dan200/computercraft/shared/peripheral/modem/WirelessModemPeripheral.java

@@ -24,6 +24,7 @@ public WirelessModemPeripheral( ModemState state, boolean advanced )
     @Deprecated
     public WirelessModemPeripheral( boolean advanced )
     {
+        // Only for backwards compatibiliy
         this( new ModemState(), advanced );
     }
 
@@ -32,7 +33,7 @@ public boolean isInterdimensional()
     {
         return m_advanced;
     }
-    
+
     @Override
     public double getRange()
     {
@@ -62,7 +63,7 @@ public double getRange()
             return 0.0;
         }
     }
-    
+
     @Override
     protected IPacketNetwork getNetwork()
     {