Add python function to clear replay cache

renderdoc/core/image_viewer.cpp

@@ -368,6 +368,7 @@ public:
     errors = "Building target shaders is unsupported";
   }
   void ReplaceResource(ResourceId from, ResourceId to) {}
+  void ClearReplayCache() {}
   void RemoveReplacement(ResourceId id) {}
   // these are proxy functions, and will never be used
   ResourceId CreateProxyTexture(const TextureDescription &templateTex)