Move modules/gui/player-list into exp_scenario/gui/player_list using the
new exp_gui element API, matching the other scenario guis.
- Store the selected player and action on the container's player data
instead of a datastore, folding the datastore on_update reactivity
into explicit setter functions
- Switch the actions config to injected accessor functions and the
exp-gui_player-list locale namespace
- Add the locale section, register in control.lua, and disable the
legacy module in the file loader
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
