Implement custom font color into markup

[tishka25]

Hello,

Your project has helped me allot, so I want to thank you for that!

Also I have made some changes to the JetFileIIProtocol.py file. It supports now custom RGB or BGR font color.

Usage example

msg = TextFile('{top}{center}{raindropsin}{font_color_rgb=30,167,124}I am in custom font color', "AB.nmg", drive='E')
serial.write(msg)

I would be very happy if you accept this contribution!

[johnoneil]

Yeah sure @tishka25 . Appreciate it. Just send the change as a Pull Request and I'll merge it.