Add class versions of retain and friends.

As class objects don't have retain counts (they're usually static, even!!),
allowing the instance implementations of retain, release, and autorelease
attempt to modify the non-existant retainCount would be a recipe for severe
headaches. We also don't want the retainCount returning "random" values.

ruamoko/include/Object.h

@@ -64,6 +64,11 @@
 + (void) poseAsClass: (Class)aClass;
 + (Class) superclass;
 
++ (id) retain;
++ (id) autorelease;
++ (/*oneway*/ void) release;
++ (unsigned) retainCount;
+
 - (id) init;
 - (void) dealloc;
 - (void) doesNotRecognizeSelector: (SEL)aSelector;

ruamoko/lib/Object.r

@@ -306,6 +306,31 @@ BOOL (id object) object_is_meta_class = #0;
 {
 	return obj_get_retaincount (self);
 }
+
+/*	The class implementations of autorelease, retain and release are dummy
+	methods with no effect. They allow class objects to be stored in
+	containers that send retain and release messages. Thus, the class
+	implementation of retainCount always returns the maximum unsigned value.
+*/
++ (id) autorelease
+{
+	return self;
+}
+
++ (id) retain
+{
+	return self;
+}
+
++ (/*oneway*/ void) release
+{
+}
+
++ (unsigned) retainCount
+{
+	return UINT_MAX;
+}
+
 /*
 	CONVENIENCE METHODS