Tighten hotkeys definitions

[kontrollanten]

Description

• Stricten fullscreen hotkey to only be targeted when shift, ctrl, alt and meta key isn't pressed.
• Stricten increase/decrease playback rate hotkey to only be targeted when shift, ctrl, alt and meta key isn't pressed.
• Stricten frame by frame hotkey to only be targeted when ctrl, alt and meta key isn't pressed.
• Remove VLC mimic when using arrow keys to instead popular video web apps.

Related issues

fixes #2810

Has this been tested?

• 👍 yes, light tests as follows are enough

1. Play a video and try hotkeys listen under Description.

[rigelk]

@kontrollanten in the future, please use reserved words to resolve related issues (i.e. fixes, resolves, etc.).

[kontrollanten]

Didn't I do that? f964a85

[rigelk]

Sure, but that's not linking the PR on GitHub and its discussion. See your first post and my edit.