Software: Remove dedicated texture/frame dumping infrastructure

Texture dumping can already be done using VideoCommon's system (and in fact the same setting already enabled *both* of these). Dumping objects/TEV stages/texture fetches doesn't currently have an equivalent, but could be added to the FIFO player instead.

Source/Core/VideoBackends/Software/SWmain.cpp

@@ -14,7 +14,6 @@
 #include "Common/MsgHandler.h"
 
 #include "VideoBackends/Software/Clipper.h"
-#include "VideoBackends/Software/DebugUtil.h"
 #include "VideoBackends/Software/EfbInterface.h"
 #include "VideoBackends/Software/Rasterizer.h"
 #include "VideoBackends/Software/SWOGLWindow.h"
@@ -105,7 +104,6 @@ bool VideoSoftware::Initialize(const WindowSystemInfo& wsi)
 
   Clipper::Init();
   Rasterizer::Init();
-  DebugUtil::Init();
 
   g_renderer = std::make_unique<SWRenderer>(std::move(window));
   g_vertex_manager = std::make_unique<SWVertexLoader>();
@@ -135,7 +133,6 @@ void VideoSoftware::Shutdown()
   if (g_renderer)
     g_renderer->Shutdown();
 
-  DebugUtil::Shutdown();
   g_texture_cache.reset();
   g_perf_query.reset();
   g_framebuffer_manager.reset();