Disable Engine::Exit() on iOS.
Disable Engine::SetAutoExit(false) on iOS and Android.
On Android, request activity finish from the Java side instead of directly exiting.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2547 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Only let the Java activity finish be requested once.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2548 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Removed call to finishActivity() as it is now being called from the native C code when the engine exits.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2549 3bd170d8-ddcf-f82c-f583-7a401ccf5608