Please add ->isPortrait property to Pageimage objects

Often in designs we have to treat images differently if they are higher than wide. Code like this bloats templates and needs more cognitive power to understand:

```php
if($img->height > $img->width) {
   ...
}
```

It would be great to have an "isPortrait" property:

```php
if($img->isPortrait) {
   ...
}
```