feat: button bar decluttering options (playlist & tooltips)

[Commander07]

This PR adds button bar decluttering options for the playlist button and tooltips.

Changes

• Added hide_empty_playlist_button which hides the playlist button when no playlist exists.
• Added gray_empty_playlist_button which grays out the playlist button when no playlist exists. Which should solve Gray out playlist button if there's no playlist? #129.
• Added tooltips_for_disabled_elements which disables tooltips for disabled/grayed out buttons. E.g. the sub track button when no subtitles are available.
• Added tooltip_hints which toggles the clarification tooltips of the information, loop, ontop and screenshot buttons.

[Keith94]

This was much needed.. thanks @Commander07

[Samillion]

Brilliant, yet another great addition. Thank you so much.

I hate to ask, but there was a recent PR that renamed some of the osc styles, which introduced a conflict. Would you mind updating this, please? #135

At a glance I think it's just:

• osc_styles.Tooltip => osc_styles.tooltip

[FreeTheTech101]

Appologizes on that, I thought I could sneak that in without causing any conflicts since there wasn't any use of styles from what I saw.

[Samillion]

Not at all, this was definitely my fault. I should have checked before merging. I would fix this myself, but right now I only have my phone.

Any inconvenience is on me, sorry for that.

[Commander07]

Brilliant, yet another great addition. Thank you so much.

I hate to ask, but there was a recent PR that renamed some of the osc styles, which introduced a conflict. Would you mind updating this, please? #135

At a glance I think it's just:

* `osc_styles.Tooltip` => `osc_styles.tooltip`

Think it should be resolved now.

[Samillion]

Much appreciated, indeed it is resolved.