File LCD_RTS.h has a spelling error

[billbrach]

Tried to compile this using VS Code / PlatformIO / Marlin Auto Build and it reports: <arduino.h> file not found. It's because it should be <Arduino.h> in file LCD_RTS.h Notice the A is capitalized.

Just found another error - in LCD_RTS.cpp it includes "lcd_rts.h" which in my copy of this code is LCD_RTS.h

And another, in LCD_RTS.cpp <wstring.h> should be <WString.h>

To Reproduce Steps to reproduce the behavior: Try to compile this version of the Marlin firmware on a Linux box - it cares about case !! There might be other spelling/capitalization issues too, as I've still not been able to get a successful compile yet.

Expected behavior No errors !!

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information): Linux Mint 20 Cinnamon Chrome, for what it's worth

Smartphone (please complete the following information): N/A

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