Add events to the Android example (can now move the logo around with touch-events).
Make some functions in Android device private which don't need to be public.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4657 dfc29bdd-3216-0410-991c-e03cc46cb475
Add yield and sleep for the Android device.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code@4658 dfc29bdd-3216-0410-991c-e03cc46cb475