Add back a couple of methods for CCEmuX compat

src/main/java/dan200/computercraft/core/computer/Computer.java

@@ -546,6 +546,12 @@ public class Computer
         ComputerThread.queueTask( task, computer );
     }
 
+    @Deprecated
+    public IPeripheral getPeripheral( int side )
+    {
+        return m_internalEnvironment.getPeripheral( side );
+    }
+
     @Deprecated
     public void setPeripheral( int side, IPeripheral peripheral )
     {
@@ -564,4 +570,6 @@ public class Computer
     {
         advance();
     }
+
+    public static final String[] s_sideNames = IAPIEnvironment.SIDE_NAMES;
 }