Move the scenario onto exp_roles and remove the legacy role system

Every call site of expcore.roles now uses exp_roles, and the legacy module,
its config, and the glue which refreshed guis on role events are deleted.
Where a file only renamed the require and the permission strings the change is
mechanical; the rest:

- Jail is now "give the Jail role" and unjail "take it away". The role has a
  higher priority than every other so holding it suppresses them, which is
  what stashing and restoring the roles was for.
- The command role authority derives exp_scenario.command.<name> from the
  command name, and the role parsers use player_outranks rather than comparing
  indexes with their own root check.
- The admin and spectator triggers, and the gui refresh on role changes, live
  in exp_scenario/control/roles.lua; the system commands trigger stays with
  the command authority.
- The player list warn button is keyed on create_warning, the permission
  the command behind it already required, and report on create_report. Both
  were keyed on names no role held, so only root ever saw them.
- The warps and tasks configs say exp_roles where they said expcore.roles.
- The role tables the readme and player list read are replaced by
  get_player_names and get_roles.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

exp_scenario/module/commands/_rcon.lua

@@ -8,6 +8,6 @@ local add_static, add_dynamic = Commands.add_rcon_static, Commands.add_rcon_dyna
 add_static("Gui", require("modules/exp_gui"))
 
 add_static("Group", require("modules.exp_legacy.expcore.permission_groups"))
-add_static("Roles", require("modules.exp_legacy.expcore.roles"))
+add_static("Roles", require("modules/exp_roles"))
 add_static("Datastore", require("modules.exp_legacy.expcore.datastore"))
 add_static("External", require("modules.exp_legacy.expcore.external"))