More work on focus, and good docs

Source/Integration/PlayerControllerBase.h

@@ -80,9 +80,6 @@ public:
 	UPROPERTY()
 	FHitResult CurrentLookAt;
 
-	// The last widget whose focus request was granted.
-	TObjectKey<UWidget> LastWidgetGrantedFocus;
-
 	// The single top-level UUserWidget added to the viewport. All
 	// top-level UI widgets are children of RootCanvas inside it.
 	UPROPERTY()
@@ -94,14 +91,5 @@ public:
 	UPROPERTY()
 	UlxRootCanvasPanel *RootCanvas = nullptr;
 
-	// The viewport client uses this to notify us that the user
-	// clicked on a focusable widget.
-	void ClickToFocus(TSharedRef<SWidget> Widget);
-
-private:
-	TWeakPtr<SWidget> ClickToFocusTarget;
-
-public:
-
 	bool MustCallLookAtChanged = false;
 };