e199ae24d4
Introduce a BackupKit and allow players holding it to change kits mid-game while preventing normal kits from being picked once the game started. Changes: - Add BackupKit implementation (kit with no abilities/items used for mid-round kit selection). - Update KitCommand: import BackupKit and GameState, add isIngame helper, disallow normal kit picks during INGAME/INVINCIBILITY, permit BackupKit to swap kits mid-game (but prevent picking the same kit) and apply playstyles accordingly. - Fix GoblinKit to also copy/restore the target's playstyle when stealing a kit and restore the player's original playstyle after timeout. - Tweak IceMageKit slow effect chance (now ~1/3 chance using random.nextInt(3) < 1). - Update en_US.yml: add messages and kit strings for backup and icemage, adjust ability_charged color, and add game/cannot-pick messages. Also includes small import and formatting adjustments.