kvui: use all flags in Item Class tooltip

[Berserker66]

What is this fixing or adding?

Allows the kivy UI to multi-class the items tooltip

How was this tested?

If this makes graphical changes, please attach screenshots.

[Silvris]

LGTM! Does not hurt to support that, tho I'm not exactly sure what could be a usecase for an item being both progression and useful, for instance. 🤔

Is it just a UI thing, or does something in the fill, for instance, behave differently?

Mostly a visual thing, but there was discussion about using the combination of progression + useful to note progression that is significantly better than other progression in the world (ie LttP Moon Pearl vs Shovel, or Stardew Shipping Bin vs a Friendsanity heart). No matter the route taken eventually, this is likely a change that would need done anyways. For fill, I believe the progression flag would take priority.

[Jouramie]

That make total sense. Especially in Stardew, we have so many progression items that just unlock one or two checks without being significant progress. Giving more hint to the fill algorithm on what is really important and what is not seems useful.