First commit, step 4 completed

docs/annotations/Annotations/Core/Widget/Intrinsic/DropdownButton.lua

@@ -0,0 +1,9 @@
+---@meta _
+---@class DropdownButtonMixin : CallbackRegistryMixin
+DropdownButtonMixin = {}
+
+function DropdownButtonMixin:OnLoad_Intrinsic() end
+function DropdownButtonMixin:OnHide_Intrinsic() end
+function DropdownButtonMixin:OnShow_Intrinsic() end
+
+---@class DropdownButton : DropdownButtonMixin, Button

docs/annotations/Annotations/Core/Widget/Intrinsic/EventFrame.lua

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+---@meta _
+---@class EventFrameMixin : CallbackRegistryMixin
+EventFrameMixin = {}
+
+function EventFrameMixin:OnLoad_Intrinsic() end
+function EventFrameMixin:OnHide_Intrinsic() end
+function EventFrameMixin:OnShow_Intrinsic() end
+
+---@param width number
+---@param height number
+function EventFrameMixin:OnSizeChanged_Intrinsic(width, height) end
+
+---@class EventFrame : EventFrameMixin, Frame