feat(#379): confirm exit from playground

[km4]

Closes #379

[mhagmajer]

@czerwinskilukasz1 looks like @km4 is taking care of #379 that you have raised :)

[mhagmajer]

Thanks for this PR @km4! Please apply Yonatan's suggestion and we can go with this 👍

[km4]

@mhagmajer I see the light in the tunnel :P

[mhagmajer]

Thanks for doing this @km4 ! Just a few nits below

[km4]

@mhagmajer some update, check now and add feedback

[mhagmajer]

Requesting some finishing touches :)

[mhagmajer]

I think that now when we have isDirty check, we can just attach onbeforeunload once for all without the need for the extra playgroundIsDirty function.

Suggested change

	});
	});
	window.onbeforeunload = function (e: any) {
	if (isDirty) {
	e.preventDefault();
	e.returnValue = '';
	}
	};

[mhagmajer]

Suggested change

	playgroundIsDirty(false);
	isDirty = false;

[km4]

@mhagmajer
what about this isDirty flag? Now is undefined variable for this scope. If I push dirty params to all functions eg.

async function executeAskScript(
  askScriptCode: string,
  askScriptServerUrl: string,
  isDirty: boolean
) {

executeAskScriptFromEditor(editor, askScriptServerUrl, isDirty); the flag dosnt update in the top.