Add more Emmet flavors

### Multiplication
With `*` operator we can define how many times `x` element should be outputted. The generator injects a `$i` variable containing the index value. This can be combined with an array storage. For example:
```timl
var x = ["tim", "is", "awesome"]
ul > li*3: $x[$i]
```
Expected output
```html
<ul>
  <li>tim</li>
  <li>is</li>
  <li>awesome</li>
</ul>
```

to be edited