HistoryController uses deprecated methods

[low-batt]

HistoryController uses deprecated methods

[low-batt]

Since we are being forced to touch it I think we should adhere to secure coding as that is a good thing to do. The changes in that commit are part of what is needed. I have some of the changes needed for secure coding. It is looking like that won't require database migration and should not be hard to implement. I am doing some testing at the moment.

[low-batt]

@svobs By the way, the big mpv / FFmpeg upgrade was just merged. You will need to download new libs once you pull develop.

[svobs]

Correcting these warnings requires changing PlaybackHistory to implement NSSecureCoding and then changing the methods in HistoryController that read and save history. I believe this will require the history database to be migrated.

Is the goal to migrate to secure coding, or just to get rid of the warnings? Here are the changes I made to do the latter: 8e11e11

[low-batt]

@svobs Please have a look at the proposed fix. I used some of the changes from your commit and added code to support secure coding.