Improve root move ordering

[FitzOReilly]

• Store ordered move list at the root
• Whenever a new best move is found, move it to the front of the list

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 :tada:

Comparison is base (3ef79e8) 92.68% compared to head (2a4c1f1) 92.74%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #168 +/- ## ========================================== + Coverage 92.68% 92.74% +0.06% ========================================== Files 85 86 +1 Lines 12832 12911 +79 ========================================== + Hits 11893 11974 +81 + Misses 939 937 -2 ``` | [Impacted Files](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck) | Coverage Δ | | |---|---|---| | [search/src/lib.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-c2VhcmNoL3NyYy9saWIucnM=) | `100.00% <ø> (ø)` | | | [movegen/src/transposition\_table.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-bW92ZWdlbi9zcmMvdHJhbnNwb3NpdGlvbl90YWJsZS5ycw==) | `99.27% <100.00%> (+0.04%)` | :arrow_up: | | [search/src/alpha\_beta.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-c2VhcmNoL3NyYy9hbHBoYV9iZXRhLnJz) | `98.26% <100.00%> (-0.16%)` | :arrow_down: | | [search/src/move\_candidates.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-c2VhcmNoL3NyYy9tb3ZlX2NhbmRpZGF0ZXMucnM=) | `100.00% <100.00%> (ø)` | | | [search/src/move\_selector.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-c2VhcmNoL3NyYy9tb3ZlX3NlbGVjdG9yLnJz) | `96.60% <100.00%> (+0.32%)` | :arrow_up: | | [search/src/search\_data.rs](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck#diff-c2VhcmNoL3NyYy9zZWFyY2hfZGF0YS5ycw==) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/FitzOReilly/fatalii/pull/168/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Patrick+Heck)

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