Support for Miracast over Infrastructure

By implementing Miracast over Infrastructure more remote displays could be used on more Ubuntu Touch powered phones.

Currently there are a couple of Mediatek devices, such as Volla Phones, that do neither support video output over USB nor is the wifi-display working at all. For these devices it would finally be possible to have a convergence experience by streaming to a Miracast over Infrastructure receiver such as a Windows PC or maybe at some time a MiracleCast receiver.

All other devices could also benefit from the data transmission over a more stable cabled connection compared to a P2P wifi connection.