Update winners picking logic

[sunce86]

Description

In a discussion with the solver team, several different algorithms were proposed to pick winners.
https://www.notion.so/cownation/Rewards-for-multiple-winners-1218da5f04ca80f2a59ed8f0174b3a69?pvs=4#1228da5f04ca8050ac31e965b120709d

We choose winners iteratively:

1. Choose solutions with largest score from remaining solutions as next winner.
2. Choose largest score of solutions with overlap to winner as reference score. The reward is winning score - reference score, the penalty is reference score.
3. Remove all remaining solutions which have token pairs in common with the winner. Whenever a solution is filtered in this procedure, additionally use all token pairs of that filtered solution for filtering remaining solutions.
4. Repeat.

Currently, the best option is "second price with aggressive filtering". This PR implements this logic.

Changes

• Instead of adding only winner's swapped tokens to already swapped tokens list, add every solution's swapped tokens, regardless if they are a winner or not.

[squadgazzz]

Lg. IMO, posting links to private resources instead of quoting seems some kind of unfair from the open source project perspective.

[sunce86]

Lg. IMO, posting links to private resources instead of quoting seems some kind of unfair from the open source project perspective.

That's true (I remember we already talked about that). I've edited the description and added the important part. But the reason why I added the link is because there are a lot of examples there which are important to understand the new logic.