Add axe to create accessibility reports

[AlbyIanna]

Why

We want to make the Arduino IDE more accessible.

How

We decided to choose axe, a tool that does automated accessibility tests at runtime.

Test instructions

• download the build and launch the executable
• open the developer tools (in the menu Help > Toggle Developer Tools)
• open the Console tab
• launch the command

runAxe()

• you will see some coloured lines spawn in the console reporting accessibility issues, like this:
  
• once you've run this command and until you close the window, as you interact with the application you will keep getting new reports

[AlbyIanna]

Thanks for the comment @kittaakos. Basically we're doing this to help the designers testing the app. We'll definitely change it as dev dependency as soon as we find a better solution.

[AlbyIanna]

Closing this because it was open for testing purposes.