Cobblemon Battle Tower

**Added**
- Added a full Battle Tower Tasks system with challenge tracking, reward claiming, and a dedicated tasks tab in the tower GUI.
- Added a new Guide tab with built-in localized tips for Singles, Doubles, Co-Op, Boss Mode, team modes, rewards, and boss hold-item suggestions.
- Added editable task config support through config/cobblemon_battle_tower/tasks.json, including support for extending, overriding, or removing tasks.
- Added a separate bp_boss_mode.json config for Boss Mode BP rewards and a dedicated Boss Mode banned Pokemon list.

**Fixes**
Fixed BP shop item names so normal shop entries now use Cobblemon or Mega Showdown item translations instead of fallback English config text.

**Adjustments**
Extended /bt reload to reload tasks and related config changes, and added /bt tasks reset for admin task refresh control.