Refactor dialogue system, move stuff to cpp and clean up BPs

Source/ProjectEleri/DialogueSystem/DialogueSubsystem.cpp

@@ -5,6 +5,17 @@
 
 #include "SpeechDataAsset.h"
 #include "Engine/AssetManager.h"
+#include "Kismet/GameplayStatics.h"
+
+UDialogueSubsystem* UDialogueSubsystem::Get(const UObject* WorldContext)
+{
+	if(const UGameInstance* GameInstance = UGameplayStatics::GetGameInstance(WorldContext))
+	{
+		return GameInstance->GetSubsystem<UDialogueSubsystem>();
+	}
+	
+	return nullptr;
+}
 
 void UDialogueSubsystem::Initialize(FSubsystemCollectionBase& Collection)
 {