gpu: Implement basic texcopy

* Improves rendering in FE:A but the screens will still not show
  because it requires surface validation

include/renderer.hpp

@@ -49,6 +49,7 @@ class Renderer {
 	virtual void initGraphicsContext(SDL_Window* window) = 0;                                // Initialize graphics context
 	virtual void clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control) = 0;  // Clear a GPU buffer in VRAM
 	virtual void displayTransfer(u32 inputAddr, u32 outputAddr, u32 inputSize, u32 outputSize, u32 flags) = 0;  // Perform display transfer
+	virtual void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) = 0;
 	virtual void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) = 0;             // Draw the given vertices
 
 	virtual void screenshot(const std::string& name) = 0;