[examples] Clean include CoreExample.

Author: dlyr

examples/CoreExample/main.cpp

@@ -6,9 +6,6 @@
 #include <Core/Utils/Log.hpp>
 #include <optional>
 #include <ostream>
-#include <set>
-#include <string>
-#include <unordered_map>
 
 int main( int /*argc*/, char** /*argv*/ ) {
     using namespace Ra::Core;