Align names and call patterns to best practice

Apply the conventions from the rocket info gui review to the player list,
and remove the now migrated legacy module.

- Move row building onto the table def as calculate_row_data, and refresh
  via refresh_player which computes the row data once per player
- Store the selection on the container with private/public accessor
  methods instead of poking element data directly
- Store the selected player as a LuaPlayer rather than a string and update
  the actions config to match
- Use :style{} on the player table and make the action and reason bars
  their own element definitions
- Delete the migrated legacy gui and its file loader entry

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

exp_legacy/module/config/_file_loader.lua

@@ -24,7 +24,6 @@ return {
     --- GUI
     "modules.gui.rocket-info",
     "modules.gui.warp-list",
-    -- "modules.gui.player-list", -- migrated to exp_scenario/gui/player_list
     "modules.gui.vlayer",
     "modules.gui._role_updates",