Improve error handling on bytes error

[bwidtmann]

In case of lost internet connection, corrupted or not available chunks on the CDN currently playback stops. This PR changes the behavior to switch to lower quality level and NOT stop scheduler in case of bytes error.

Additionally restrict ABR controller to not switch to unavailable quality level(s) for a certain time (configurable). (line 648 - 669) I know changing configuration at runtime is not a smart way but this was a clean way without changing a lot of files.

[bbert]

Thanks for this PR. We will have a look, try it and provide you a feedback as soon as possible.
However, some first remarks:

• If we are already at lowest quality and this quality is not available, we will keep asking for this lowest quality
• To set manually quality and disable ABR, instead of modifying configuration, you can use abrController.setPlaybackQuality() and abrController.setAutoSwitchBitrate() methods
• I would rename "ABR.resetABRRestrictionsInterval" by "BufferController.onErrorABRDisableInterval(or Duration)", since it is more related to BufferController than to ABRController and maybe more explicit

[bwidtmann]

I could restart with highest quality, if we reach lowest quality and is not available. So in case of lost internet connection, it would be a loop through all quality levels until one is available again.

I know the abrController.setAutoSwitchBitrate(), but I do not want to switch it off in case of not available quality level.

Yes, I will rename it to BufferController.onErrorABRDisableInterval.