Spine does not account for phaseAtlas

[PirateIzzy]

When rendering Spine atlas files, phaseAtlas is not accounted for, meaning that certain boss phases (Chaos Zakum and Ursus) do not allow for rendering. I have recorded a video to showcase how the phaseAtlas shows additional phase data for Chaos Zakum (8800102) and Ursus (8881000), but WCR2 does not have an option to display these phases. Certain other Spine bosses, namely Elunite Elemental (9402197) and Julieta (9402280) are coded slightly differently and use a different phase technique from phaseAtlas.
https://www.youtube.com/watch?v=HKoDzwWM1xU

For reference, this is how phaseAtlas appears in game for Chaos Zakum.
Regular:

Phase 3 (the red crest is due to one of Zakum's buffs):

Phase 4:

The corresponding spritesheets are shown at 0:36 - 0:50 in the video, and I'll share them here:
Regular:

Phase 3:

Phase 4:

[Kagamia]

Zakum and Ursus were introduced at a very early stage, it didnot fully use all spine features like Skins. So it designed another data structure (phaseAtlas) for the same approach.

Checked the entire CMS204 client, there're only 4 cases:

Do we really need the feature for them two🤣? Let me file a work item for it.

[PirateIzzy]

Up to you if you think it's worthwhile. Seems like Nexon doesn't add a lot of bosses with Spine animation anymore so might not be a high priority. Plus, Ursus is being removed so that's one less boss.