Add Java support for std::unique<T> for input parameters.

This works by transferring ownership of the underlying C++ memory
from the target language proxy class to an instance of the unique_ptr
which is passed to the wrapped function via std::move.

The proxy class has a new swigRelease() method which sets the
underlying C++ pointer for the proxy class to null, so working
in much the same way as std::unique_ptr::release(). Any attempt at
using the proxy class will be the same as if the delete() function
has been called on the proxy class. That is, using a C++ null pointer,
when a non-null pointer is usually expected.

This commit relies on the previous commit that uses std::move
on the temporary variable used for the wrapped function's input parameter
as std::unique_ptr is not copyable, it has move-only semantics.

Source/Modules/java.cxx

@@ -2025,6 +2025,8 @@ public:
 	   typemapLookup(n, "javabody", typemap_lookup_type, WARN_JAVA_TYPEMAP_JAVABODY_UNDEF),	// main body of class
 	   NIL);
 
+    Printv(proxy_class_def, typemapLookup(n, "javarelease", typemap_lookup_type, WARN_NONE), NIL);
+
     // C++ destructor is wrapped by the delete method
     // Note that the method name is specified in a typemap attribute called methodname
     String *destruct = NewString("");