Move sc_main into own file for benchmarks

benches/addressdecoder.cpp

@@ -78,10 +78,3 @@ static void encode(benchmark::State& state)
 }
 
 BENCHMARK(encode);
-
-int sc_main(int argc, char** argv)
-{
-    ::benchmark::Initialize(&argc, argv);
-    ::benchmark::RunSpecifiedBenchmarks();
-    return 0;
-}