Added object.* library; added cosmoO_isDescendant to cobj.[ch]

The object library includes:
- __proto getter and setter tables (might make an option to lock __proto in the future)
- ischild()

cosmoB_loadDebug was renamed to cosmoB_loadVM and now only loads the VM library

src/main.c

@@ -52,7 +52,7 @@ static void repl() {
 
     CState *state = cosmoV_newState();
     cosmoB_loadLibrary(state);
-    cosmoB_loadDebug(state);
+    cosmoB_loadVM(state);
 
     // add our custom REPL functions
     cosmoV_pushString(state, "quit");