ZenGL 0.3.4

Changelog:
- [Android]added tex_Restore*, font_RestoreFromFile, rtarget_Restore, emitter2d_RestoreAll and video_Restore functions
- [Android]implemented restoring of resources for all demos
- [iOS]fixed problem with orientation on iOS 6 when compile with iOS SDK 6.0
- added C/C++ export for some file_* functions
- added more demos for C/C++

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