GS/Null: Move methods to cpp file

pcsx2/GS/Renderers/Null/GSRendererNull.cpp

@@ -15,3 +15,14 @@
 
 #include "PrecompiledHeader.h"
 #include "GSRendererNull.h"
+
+GSRendererNull::GSRendererNull() = default;
+
+void GSRendererNull::Draw()
+{
+}
+
+GSTexture* GSRendererNull::GetOutput(int i, int& y_offset)
+{
+	return nullptr;
+}

pcsx2/GS/Renderers/Null/GSRendererNull.h

@@ -19,28 +19,10 @@
 
 class GSRendererNull final : public GSRenderer
 {
-	class GSVertexTraceNull : public GSVertexTrace
-	{
-	public:
-		GSVertexTraceNull(const GSState* state)
-			: GSVertexTrace(state)
-		{
-		}
-	};
+public:
+	GSRendererNull();
 
 protected:
-	void Draw() override
-	{
-	}
-
-	GSTexture* GetOutput(int i, int& y_offset) override
-	{
-		return NULL;
-	}
-
-public:
-	GSRendererNull()
-		: GSRenderer()
-	{
-	}
+	void Draw() override;
+	GSTexture* GetOutput(int i, int& y_offset) override;
 };