[fix] save resume points on exit

[Rechi]

Description

saving resume points is done with a job, so it has to happen before all jobs are cancelled

Motivation and Context

fixes https://trac.kodi.tv/ticket/17757

How Has This Been Tested?

started a video, exited kodi without stopping the file, restarted kodi and checked resume point

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[FernetMenta]

this will break again. better make saveFileState independent from jobManager. you can check if running on a job succeeds. if not, run it on the calling thread.

[Rechi]

confirmed by @FernetMenta that it can be merged, as playback shouldn't be stopped that late