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Ensures Traveler retains talent levels and constellations on inactive elements when switching elements.
Relevant for any other skillDepot-changing activities like Windtrace too, though keeping those in the db might not be as useful.

Refactor avatar talent upgrade and access
Refactor skillExtraCharges

Original commits:

* create `SetConstCommand` class and translations

* (partially) functional `setconst` command

* fixed punctuation

* added success message

* implemented `SetConstCommand`

* added translation keys

* update keys

* refactor + automatic reload

* Nitpick (Co-authored-by: AnimeGitB <AnimeGitB@bigblueball.in>)