Maintenance: Move mid-file forward declarations out of .cpp files into owning headers: CUIListBoxEx explicit-specialization declarati
Batch #18338 by ragnarok-clanker: no function's compiled code changes; checked with 433 compiled unit(s), including every includer of Source/Client/Application/ApplicationWindow.h, Source/Client/Mode/CGameMode.h, Source/Client/Session/Session.h, Source/Contents/Configuration/ServiceOptions.h, Source/Contents/Map/MapSkyMgr.h, Source/Contents/Messenger/ClientMessenger.h, Source/Contents/SignBoard/SignBoard.h, Source/Contents/Skills/ClientSkills.h, Source/Contents/Sound/SoundConfiguration.h, Source/Render/DX7/RenderSystemDX7.h, Source/Render/Device/DisplayMode.h, Source/Resource/Json/JsonCppLoader.h, Source/Security/NProtectGameGuardMgr.h, Source/UI/Cooldowns/CooldownOwner.h, Source/UI/Enchant/EnchantUI.h, Source/UI/Exchange/UIExchangeUI.h, Source/UI/GameSettings/GameSettingsUI.h, Source/UI/ProbabilityTable/UIProbabilityTable.h, Source/UI/Quest/UIOngoingQuestInfo.h, Source/UI/RuneSystem/UIRuneSystemWnd.h, Source/UI/SelectPackageItemBox/SelectPackageItemBox.h, Source/UI/SkillDelayInfo/SkillDelayInfo.h, Source/UI/Text/TextWrapping.h, Source/Contents/Actors/Resources/BodyResources.h, Source/Resource/Json/JsonCppLoaderExternal.h, Source/Resource/Json/JsonCppLoaderParsing.h, Source/Security/NProtectGameMon.h.
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