Migrate player list gui to scenario (#421)

* Migrate player list gui to scenario

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>

* 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>

* Address player list review feedback

- Rename the player table element data class to element_data
- Remove the redundant offline selection clear; on_player_left_game
  already clears any selection pointing at a player who disconnects
- Move the action bar and reason bar visibility into their own refresh
  methods so refresh_player just delegates to them

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

* Style and locale fixes

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Cooldude2606 <25043174+Cooldude2606@users.noreply.github.com>

exp_scenario/module/commands/clear_inventory.lua

@@ -14,7 +14,7 @@ Commands.new("clear-inventory", { "exp-commands_clear-inventory.description" })
     :register(function(player, other_player)
         local inventory = other_player.get_main_inventory()
         if not inventory then
-            return Commands.status.error{ "expcore-commands.reject-player-alive" }
+            return Commands.status.error{ "exp-commands-parse.player-alive" }
         end
 
         transfer_inventory{