Introduced a GUI system to facilitate class selection in the CTF game. This includes an abstract GUIInventory, GUIListener for event handling, and a ClassSelectionGUI for selecting classes. Also, added the "selectclass" command and integrated the GUI with game mechanics for improved player interaction.
Introduced new flag-related mechanics and game phases including `CombatPhase`, `EndedPhase`, and relevant event handling for better gameplay management. Enhanced team and player functionalities while making incremental adjustments to improve overall code structure.
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