Fortress Under Siege

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1. Added Immersive Mode support. (KitKat or higher).
2. Added language support forTraditional Chinese, Simplified Chinese.
3. Improved the processing logic for the Back key.
4. Updated to the latest Google Billing services.
5. Add support for x86 device. (Intel inside)
6. Added automatic screen orientation. (Gingerbread or higher)
7.Fixed system crash in Android 4.0 or higher when locking screen.