Run button issues (enhancement)

[The-furf-of-July]

Disclaimer: enhancement, not bug

The run button appears to occupy the entirety of the program's processing, leading to crashes if anything loops, and long periods of time where the application window is unusable.

If multithreading is possible, maybe it would be doable to keep the window functioning properly while the code is running.

Other useful features that could go along with this would be a visual indicator showing that the code is in the process of running, and/or a stop button.