When grabbing D3D12Core also grab D3D12SDKLayers for validation

* The D3D12SDKLayers needs to match the D3D12Core, so we save both when possible
  (the SDKLayers dll might not be loaded during capture but it should be next to
  the D3D12Core. On replay if we have one we put it next to the D3D12Core we're
  using for replay, and if not we forcibly disable debug otherwise we may crash.

renderdoc/api/replay/renderdoc_tostr.inl

@@ -1030,6 +1030,7 @@ rdcstr DoStringise(const SectionType &el)
     STRINGISE_ENUM_CLASS_NAMED(EmbeddedLogfile, "renderdoc/internal/logfile");
     STRINGISE_ENUM_CLASS_NAMED(EditedShaders, "renderdoc/ui/edits");
     STRINGISE_ENUM_CLASS_NAMED(D3D12Core, "renderdoc/internal/d3d12core");
+    STRINGISE_ENUM_CLASS_NAMED(D3D12SDKLayers, "renderdoc/internal/d3d12sdklayers");
   }
   END_ENUM_STRINGISE();
 }

renderdoc/api/replay/replay_enums.h

@@ -104,6 +104,12 @@ version of RenderDoc that addes a new section type. They should be considered eq
   This section contains an internal copy of D3D12Core for replaying.
 
   The name for this section will be "renderdoc/internal/d3d12core".
+
+.. data:: D3D12SDKLayers
+
+  This section contains an internal copy of D3D12SDKLayers for replaying.
+
+  The name for this section will be "renderdoc/internal/d3d12sdklayers".
 )");
 enum class SectionType : uint32_t
 {
@@ -119,6 +125,7 @@ enum class SectionType : uint32_t
   EmbeddedLogfile,
   EditedShaders,
   D3D12Core,
+  D3D12SDKLayers,
   Count,
 };