Tweaks to improve the Project Manager display at small sizes

[aaronfranke]

• Change the minimum size of the About dialog to allow it to shrink to a smaller but still usable size.
• Change the names of the tabs to either verbose names or shorter names depending on the window size.
• Change the column count of the Asset Library GridContainer depending on the window size.
• Enable text clipping on the OptionButtons in the Asset Library tab to allow this menu to shrink down farther.

This PR would make sense to merge before #61211. With both of these PRs combined, we can get down to about 520px wide before things start clipping, and it's not trivial to make the Asset Library tab shrink more than that.

[Calinou]

Preview with the minimum size ignored for demonstration purposes:

simplescreenrecorder-2022-05-20_14.33.11.mp4

simplescreenrecorder-2022-05-20_14.35.33.mp4

---

Tip: To ignore Godot's minimum window size without recompiling using KWin, press Alt + F3 then choose More Actions > Configure Special Application Settings…:

Then use Add Property… in the bottom-left corner of the dialog and search for Minimum Size. You may have to do this twice due to a KWin bug.

[akien-mga]

Looks pretty good. Maybe we could also shorten (or simply hide) the version label when the window is too small to avoid the overlap (though I guess it doesn't happen when the minsize is respected, but maybe it can make it possible to reduce the minsize further?).

[akien-mga]

Thanks!

[Calinou]

Maybe we could also shorten (or simply hide) the version label when the window is too small to avoid the overlap (though I guess it doesn't happen when the minsize is respected, but maybe it can make it possible to reduce the minsize further?).

Indeed, this is worth looking into to further improve display on Android. I would shorten the label to still display major.minor.patch at least, but the build identifier and commit hash can be hidden.

To save a bit of space on the full version label, we could drop the v prefix too.