feat: Add Default Speed for Music Videos

[JensorX]

Introduces a new "Default Speed for Music Videos" setting to the settings page.
If this setting is activated, the speed of music videos will be automatically set to 1x (regardless of the default playback speed) with a music video detection.

Example:
User watches a normal video -> 1.5x speed
After that, the User watches a Music Video -> 1x speed
User watches a normal video -> 1.5x speed

[ice-fly]

Your logic appears to work and I agree with the feature.
Just a thought:
I feel like the majority of videos will not be music, so perhaps this would be a good opportunity to lazily determine if the video is a music video as the page renders (the first 25ms of music at 2x probably doesn't matter and this may aid performance on the other case where users want fast playback).

[JensorX]

Good Idea!
I improved the feature with a lazy load after 25ms.