Whiteboard 【add text,paint】

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Version 2.1.0:save memory. Fix bug
version 2 : you can use vertical screen.
version 1.9 you can redo and undo after all erase.
version 1.8.6 : I fix text.
version 1.7.1 : you can change font in text(tool)
version 2.2.8: I add text font.
version 1.6.7: I fixed text.
version 1.6.6: I update Text(tool).
version 1.6: I add Transparent background(tool). I change text box to Rounded corners. and I introduce rater system.
and I have to add right of "ACCESS_NETWORK_STATE";