Read mobile/tablet support from AppStream

Note: Determining Device Types
Please note that a display with a lot of vertical space may not be a television screen, but could also be a large gaming monitor. Similar logic applies to the smaller screen sizes. Therefore, to indicate that an application runs well on a certain device and not just on a certain display, additional metadata is needed, like the application's supported input controls as defined via .

<display_length/> 700px for phones and 1000px for tablets. <control/> touch for phones and tablets (support is already available).

Save in extra.intended_for_mobile.