Investigate using Appium for desktop GUI tests

[damies13]

Is your feature request related to a problem? Please describe.
I've become aware it might be possible to automate MacOS, Linux and Windows desktop apps with Appium Library, so we should investigate if this will work with RFSwarm

Describe the solution you'd like
Investigate using Appium for desktop GUI tests

• will it work for RFSwarm (tkinter based app)?
  • works on Windows?
  • works on MacOS?
  • works on Linux?

Additional context

https://forum.robotframework.org/t/windows-desktop-application-library-validation-experiences/7877?u=damies13

http://appium.io/docs/en/latest/ecosystem/drivers/

Official Drivers

Driver	Installation Key	Platform(s)	Mode(s)
Mac2	mac2	macOS	Native
Windows	windows	Windows	Native

Other Drivers

Driver	Installation Key	Platform(s)	Mode(s)	Supported By
Linux	--source=npm @stdspa/appium-linux-driver	Linux	Native	@fantonglang