Playback of an episode stops

[brot]

Today I listend to an episode and the playback of detlef stopped.

• the first time I started a download over my wifi
• the second time I started Airdroid and the playback stopped the moment I logged into my phone from my desktop
• the third time after I started aLogCat. Sadly there is no usable log output

When I start the playback again it starts about 10-15min before it stops. I think the last position I pressed pause by myself.

With this behaviour Detlef is really useless because I have to find the right position in the episode every time Detlef stops the episode

[rjmunro]

I think this is 2 problems:

• Make Detlef less likely to stop / crash when other apps are run - It needs to use Android's foreground mode if it doesn't already. I've added #39 for this.
• Make Detlef remember where it has got to periodically during playback, not just on pause, in case it exits or crashes unexpectedly. Perhaps about every 10 seconds.