Added NOT Instruction

Server/src/net/simon987/server/assembly/DefaultInstructionSet.java

@@ -36,6 +36,7 @@ public class DefaultInstructionSet implements InstructionSet {
         add(new TestInstruction());
         add(new CmpInstruction());
         add(new NegInstruction());
+        add(new NotInstruction());
     }
 
     /**

Server/src/net/simon987/server/assembly/instruction/NotInstruction.java

@@ -0,0 +1,21 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+public class NotInstruction extends Instruction {
+
+    public static final int OPCODE = 29;
+
+    public NotInstruction() {
+        super("not", OPCODE);
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, Status status) {
+        dst.set(dstIndex, ~dst.get(dstIndex));
+
+        return status;
+    }
+}