use base type as member variable
Make onActivityResult accessbile for others

For some third-party libs it's required to handle messages send to
onActivityResult of the main activity. But with the transition to NativeActivity
this rather difficult to add custom callbacks to onActivityResult.

With this change it's possible to register listeners that get called once
something triggers onActivityResult. All listeners are stored and managed in
Cocos2dxHelper, because it seems to be the current best place for "helper stuff
that android requires here and there". Cocos2dxNativeActivity is the new root
activity and inherits from NativeActivity. The only change here is a little loop
in onActivityResult to iterate through and call all listeners.

Why don't store and manage all listeners in Cocos2dxNativeActivity itself? I'd
like to keep the Cocos2dxNativeActivity as short, simple and close to the
NativeActivity as possible. And by moving all helper stuff into Cocos2dxHelper
it's pretty easy to search/grep through all java files and have a look at such
custom integrations (similar to "(int)" vs "static_cast<int>()" in c++).
various other changes

Conflicts:
	extensions/GUI/CCScrollView/CCScrollView.h
path in tizen project files updated
michael local stuff