A way to remove extensions from item

[ransome1]

In the next branch, you can set an extension like item.setExtension('pri', 'A');

Once it is set, you can null the value, but you can't remove the whole extension object. So even if you set the extension to null, it will be part of item.toString(): pri:null

We might want to think about a way to remove extensions, like item.removeExtension('pri');

[madeindjs]

@ransome1 , it seems to be possible, you simply need to specify the value of the extension like

item.removeExtension('pri', 'A');

There is a test which cover that

jsTodoTxt/src/Item.extensions.test.ts

Lines 45 to 53 in 2a71923

	test('removeExtension › Removes the extension by key and value', (t) => {
	const item = new Item('My room:kitchen wall is painted color:blue and color:red');
	item.removeExtension('color', 'blue');
	t.deepEqual(item.extensions(), [
	{ key: 'room', value: 'kitchen' },
	{ key: 'color', value: 'red' },
	]);
	t.is(item.body(), 'My room:kitchen wall is painted and color:red');
	});