* reorganized main project a bit:
* changed name of java package to org.wxwidgets.<class> ex. org.wxwidgets.MainActivity for main activity
* renamed wxAndroidApp to wxAppMgr
* each event listener will get own class

Skeleton app:
* updated skeleton app to match main project changes
* compiled wxWidgets libraries go to jni/libs folder now ( old: jni/<platform>/lib<>.so   new: jni/libs/<platform>/lib<>.so )