feat(GUI): remove pack-state buttons

[Rudxain]

Describe the feature you want

This would simplify the code (less maintenance burden) and it would make the app safer (users are less likely to uninstall on accident)

I believe the "Review selection" button should be the primary way to change the state of 1 or more packages, as it serves as a confirmation-dialog before doing a potentially-irreversible action (pm clear)

Acknowledgements

• [X] This issue is not a duplicate of an existing feature request.
• [X] I have chosen an appropriate title.
• [X] All requested information has been provided properly.

[Rudxain]

BTW, everytime I scroll through the pack-list, I feel anxious, because the mouse is dangerously close to the buttons