Revert "Be less dumb."

Revert "Actually, filename really does need to be a parameter because of some random debug thing."
Revert "fix non-HAVE_WX case"
Revert "Handle screenshot saving in RenderBase.  Removes dependency on D3DX11 for screenshots (texture dumping is still broken)."

This reverts commits 00fe5057f1, 74b5fb3ab4, cd46138d29 and 5f72542e06 because taking screenshots in D3D still crashed for me so there was no point in the code changes (which I found ugly anyway).

Source/Core/VideoBackends/OGL/Src/Render.h

@@ -63,7 +63,7 @@ public:
 
 	void RenderText(const char* pstr, int left, int top, u32 color) override;
 	void DrawDebugInfo();
-	static void FlipImageData(u8 *data, int w, int h);
+	void FlipImageData(u8 *data, int w, int h);
 
 	u32 AccessEFB(EFBAccessType type, u32 x, u32 y, u32 poke_data) override;
 
@@ -80,7 +80,7 @@ public:
 
 	void UpdateViewport() override;
 
-	static void TakeScreenshot(const TargetRectangle &rc, std::string filename);
+	bool SaveScreenshot(const std::string &filename, const TargetRectangle &rc);
 
 private:
 	void UpdateEFBCache(EFBAccessType type, u32 cacheRectIdx, const EFBRectangle& efbPixelRc, const TargetRectangle& targetPixelRc, const u32* data);