Engine: reworks Twitch IRC parsing/client + Streamer event surface (viewers roster, chat/sub/gift/raid messages) and removes older/broken Twitch API features.
Menu/Editor: adds service linking/stream-connect UI (new Services modal; pause/game modal + editor title button) gated by a project setting.
Services/utilities: introduces helper APIs for linking/listing services; adds unit tests for the IRC parser and subscription tier parsing.
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