Maintenance: Annotate globals on their definitions only; drop annotations from header externs
Batch #904 by ragnarok-clanker: no function's compiled code changes; checked with 3 compiled unit(s), including every includer of Source/Contents/MessageTable.h, Source/Contents/Async/AsyncWorkMgr.h, Source/Contents/Emblems/EmblemDataMgr.h, Source/Contents/Hotkeys/UserHotkeyMgr.h, Source/Contents/Messenger/WhisperBlockMgr.h, Source/Contents/Party/AdventurerAgencyMgr.h, Source/Contents/UserData/AccountLinkedUserDataMgr.h, Source/Contents/UserData/CharacterLinkedUserDataMgr.h, Source/Network/TextEncoding.h, Source/Network/Http/CURLMgr.h, Source/Render/Textures/Texture.h, Source/UI/Layout/SnapMgr.h, Source/UI/Party/UIRequestJoinPartyMgr.h, Source/UI/Window/FrameFocus.h, Source/UI/Window/UIWindow.h, Source/Utility/Async/NMessageMgr.h.
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