Make escape not close stonesense, or make it confirm/overrideable

[robob27]

I have closed the stonesense window with the escape key many many times by accident, but never on purpose. It seems unnecessary with the other options available to close the app (X button, ALT+F4) unless I'm missing something. If there is a good reason for it, perhaps we could add it to the keybinds that are changeable, or at the very least give it a confirmation dialog?

[robob27]

Resolved this locally by removing

stonesense/main.cpp

Lines 362 to 363 in 2908625

	} else if (event.keyboard.keycode == ALLEGRO_KEY_ESCAPE) {
	return;