Chess tempo - Train chess tact

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Added latest opening trainer features:
- Syncing your repertoire with opening explorer and engine eval stats
- Opening sunburst repertoire visualisation.
- Request engine analysis for an entire repertoire (Diamond members only).
- Learning mode that prioritises most commonly played lines first.
- List of all repertoire moves providing sorting by engine evals, explorer stats, or performance.
- Options for colouring opening tree based on engine, explorer or learning metrics stats.