New J2K: add multi-file conversion tests from old j2k

nj2k/testData/multiFile/FieldToProperty/JavaClass.java

@@ -0,0 +1,13 @@
+package test;
+
+public class JavaClass {
+    public int field = 0;
+
+    protected int myProperty = 0;
+
+    public int getProperty() {
+        return myProperty;
+    }
+
+    public static final String NAME = "Bar";
+}