Whiteboard 【add text,paint】

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version 2.4.1 : I fix circle(tool)
Version 2.3.4 : I make palette tool.
version 2.3.2: I fix text border when you use it with Vertical screen.
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).