Change the folder structure of the vulkan backend to better reflect what is going on

src/common/rendering/vulkan/vk_pprenderstate.h

@@ -0,0 +1,27 @@
+
+#pragma once
+
+#include "hwrenderer/postprocessing/hw_postprocess.h"
+#include <zvulkan/vulkanobjects.h>
+
+class VkPPRenderPassSetup;
+class VkPPShader;
+class VkPPTexture;
+class VkTextureImage;
+class VulkanRenderDevice;
+
+class VkPPRenderState : public PPRenderState
+{
+public:
+	VkPPRenderState(VulkanRenderDevice* fb);
+
+	void PushGroup(const FString &name) override;
+	void PopGroup() override;
+
+	void Draw() override;
+
+private:
+	void RenderScreenQuad(VkPPRenderPassSetup *passSetup, VulkanDescriptorSet *descriptorSet, VulkanFramebuffer *framebuffer, int framebufferWidth, int framebufferHeight, int x, int y, int width, int height, const void *pushConstants, uint32_t pushConstantsSize, bool stencilTest);
+
+	VulkanRenderDevice* fb = nullptr;
+};