Fix: Added includes, now build pipeline runs through

The errors were caused by missing includes in SFStudySetup.h (that were marked as "possibly unused" in VS). This lead to a problem, where the UPROPERTY()-macro was not properly recognised because the type of object declared as UPROPERTY() was not known due to the missing includes. The error that appeared was a syntax error because the UPROPERTY() macro was not properly handled by the build tool and remained in the code as if it was standard C++.

Source/StudyFrameworkPlugin/Public/SFStudySetup.h

@@ -7,6 +7,9 @@
 #include "HUD/SFExperimenterWindow.h"
 #include "Logging/SFLogObject.h"
 #include "GazeTracking/SFGazeTracker.h"
+// includes below marked as "possibly unused", but they are vital for build to succeed
+#include "Components/BillboardComponent.h"
+#include "Engine/Texture2D.h"
 
 #include "SFStudySetup.generated.h"