android (service): set autorestart: with this option, the backend will automatically restart as soon as terminated. This is notably important at the moment to work around a P4A bug which result in a backend killed when frontend is closed (cf. https://github.com/kivy/python-for-android/issues/2053)

f95d0c31d45558c7b3e2fc39398f51eb0190bdca 0.7.0a1
4233be74572a1af8eebd502c009a10641c63ca0c 0.7.0a3
5c28cf8815319abd8c963022091cf4726764a3e6 0.7.0b1
51f73d210da908c9fb292e6bd7fda42a9d2b8453 0.7.0