Fixed Mobile app

Back and header buttons on Android, and the podcast microphone test

On Android, Back and labelled buttons at the top of a screen now appear, and the podcast microphone test and recordings start.

On Android, the Back button and labelled buttons at the top of screens, such as New event and Edit, were not shown. Back is now the Android back arrow, and labelled buttons appear with their names.

On Android, Record a test in a podcast recording session, and recording itself, stopped straight away unless notifications were on for Magpie. Recording that continues in the background shows a notification, so the app now asks for notifications when you start. If you decline, recording still works while Magpie is open and pauses when you leave it. If a test or a recording cannot start, the reason is shown beside it.