Display playback progress in activity sheet

[micahmo]

Description

This PR adds support for displaying the playback percentage in the activity bottom sheet. For now I have put it to the left of the elapsed/total time with a bullet to separate, but I am open to other suggestions.

Fixes Tautulli/Tautulli-Remote#191

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas

[TheMeanCanEHdian]

Looks good! Thanks for the PR.