[Feature Request] Add command line arguments to generated main()

[mikomikotaishi]

I think that we should add command line arguments to the main() (so the signature will be int main(int argc, char* argv[])). My line of reasoning is that a lot of projects will just end up needing command line arguments anyway, while those who do not would not be negatively impacted by its presence in main(), so it might as well be included to save the trouble.

[ken-matsui]

#1236