Add in team-focused features

[user23498723452]

1. Add in the default/ability to quickly sort (arena) teams by team PI, highest to lowest.

2. Add in option to leave weakest champs as extras in arena team calculations. (so use modulus-like math to find the Extras after sorted by PI) I find it odd that the tool focuses so heavily on PI that it ignores the obvious benefit of stronger PI champs. Finding two high PI champs excluded likely means a bigger loss than the synergy gain, but I could be wrong.

3. For sandbagging option usage, only show teams where sandbagging is used. (Two maxed 3* and 1 3*/1/1).

4. Seems like there may be something wonky with the team PI calcs. I've seen it ignore "Max Team PI" for some reason. Unclear if Sandbagging triggers this or not.