generate Csharp test code for issue560

Author: billsegall

build.gradle

@@ -643,6 +643,7 @@ task generateCSharpCodecs(type: JavaExec) {
     args = ['sbe-tool/src/test/resources/FixBinary.xml',
             'sbe-tool/src/test/resources/issue435.xml',
             'sbe-tool/src/test/resources/issue483.xml',
+            'sbe-tool/src/test/resources/issue560.xml',
             'sbe-tool/src/test/resources/since-deprecated-test-schema.xml',
             'sbe-tool/src/test/resources/example-bigendian-test-schema.xml',
             'sbe-samples/src/main/resources/example-schema.xml',