Switch off syntax- and error checking for performance reasons

[diovudau]

I am using Inky in school as a teacher. Our computers are not super slow, but they are underperforming when it comes to inky.
The problem is that there is apparently an error check after every change and keystroke.
Error checking is good and useful, but it would be nice to turn the automatic checks off in a menu to save some CPU cycles.

Thank you for your consideration!