Windows background execution

[YoSarin]

Difference from original repository

This repository is trying to solve issues with Windows compatibility of original plugin (mainly by finding workarounds for issue #222).

Changes

1. Plugin hook to add windows capability backgroundMediaPlayback into windows *.appxmanifest files
2. Usage of Windows.ApplicationModel.ExtendedExecution functionality to keep app running when minimized
3. Starting audio playback automatically (to keep application running; quiet, but playing) - might have performance & battery impact

Upsides

1. Plugin works for Windows applications (Desktop windows tested, haven't tested @mobile)
2. You can pause application background tasks by clicking pause button under application hover-preview in taskbar (side effect of being "media-app")

Downsides

1. Windows target is not buildable by [ionic] cordova build|run windows with package cordova-windows in version lower than 6.0
2. When you're removing plugin, capability of backgroundMediaPlayback is kept in *.appxmanifest files, which means, that app is still not buildable by Cordova CLI (cordova-windows lower than 6.0; to fix it, remove/readd windows platform to project after plugin removal)
3. Possible severe performance issues/battery drains, because of continuous unstopped playback

[nowrap]

I tried to get this to work in an ionic 3 app.

First i removed the background-mode plugin:
ionic cordova plugin rm cordova-plugin-background-mode

Afterwards i added YoSarins branch:
ionic cordova plugin add https://github.com/YoSarin/cordova-plugin-background-mode.git#windows_background_execution

But still my app is paused and audio playback is stopped, when minimizing it.