Add QtAction and add more methods to QtWidget

QtCore/QtEvent.mm

@@ -23,7 +23,7 @@
 #import "QtEvent.h"
 
 @implementation QtEvent
-@synthesize qEvent = _eEvent;
+@synthesize qEvent = _qEvent;
 
 + (int)registerEventType: (int)hint
 {

QtCore/QtObject.mm

@@ -91,6 +91,8 @@
 		[children addObject:
 		    [[[QtObject alloc] initWithQObject: qChild] autorelease]];
 
+	[children makeImmutable];
+
 	objc_autoreleasePoolPop(pool);
 
 	return children;
@@ -144,6 +146,8 @@
 		[dynamicPropertyNames addObject: dynamicPropertyName];
 	}
 
+	[dynamicPropertyNames makeImmutable];
+
 	objc_autoreleasePoolPop(pool);
 
 	return dynamicPropertyNames;