Party Support for `get_sorted` in policy.py

[CodeSammich]

Can you introduce global party skills to be included in the skill graphs? For the get_sorted in the policy.py, we could add a 0-delay party skill as global variable? For example, if we are seeing Night Lord DPS, we can add 0-delay Prayer to the list as well so that we can compute across different party compositions.

Also, a non-KMS helpful Party Buffer is Kanna.

For party, she has skills:

• Haku's Blessing: increase party Magic ATT by 40% of Haku's Fan (Kanna Secondary)
• Spirit's Domain: 33% Final Damage?... at Lv30 V skill
• Blossom Barriers (some % Boss Damage)

Her solo DPS is harder to compute, but it would be important to include some of her skills for party-style DPS calculation in non-KMS regions.

[CodeSammich]

Also, if we include party skills in current graph system, then there is also an issue of optimizing across 6-man party, because perhaps each person will want slightly different buff time. But this is a problem that can be solved with Deep/Reinforcement Learning policy network, I believe.