[Java] Expose actingVersion (#953)

* [Java] Expose actingVersion

* ir codec update

Author: ratcashdev

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/java/JavaGenerator.java

@@ -2716,6 +2716,11 @@ private CharSequence generateDecoderFlyweightCode(final String className, final
             "        final int decodedLength = encodedLength();\n" +
             "        limit(currentLimit);\n\n" +
             "        return decodedLength;\n" +
+            "    }\n\n" +
+
+            "    public int actingVersion()\n" +
+            "    {\n" +
+            "        return actingVersion;\n" +
             "    }\n\n";
 
         return generateFlyweightCode(DECODER, className, token, methods, readOnlyBuffer);

sbe-tool/src/main/java/uk/co/real_logic/sbe/ir/generated/FrameCodecDecoder.java

@@ -120,6 +120,11 @@ public int sbeDecodedLength()
         return decodedLength;
     }
 
+    public int actingVersion()
+    {
+        return actingVersion;
+    }
+
     public int encodedLength()
     {
         return limit - offset;

sbe-tool/src/main/java/uk/co/real_logic/sbe/ir/generated/TokenCodecDecoder.java

@@ -120,6 +120,11 @@ public int sbeDecodedLength()
         return decodedLength;
     }
 
+    public int actingVersion()
+    {
+        return actingVersion;
+    }
+
     public int encodedLength()
     {
         return limit - offset;