This Weekend in Meson++ (February 6th)

 Meson++ is 1 year old! It's strange to think that February 9th, 2021, was the first commit to meson++, and a year later, we have a working flex+bison C++ frontend, an optimizing mid level IR, a file based backend IR, and the ability to generate simple ninja programs! It's a strange and proud feeling. 

Anyway, I haven't implemented any sweepingly huge features this week, but we have landed support for `declare_dependency`, an important first step toward real dependencies (like those found by pkg-config).

I also implemented a simple optimization for finding unreachable code. In this case, we look for the `error` function, and mark any instructions after that as dead, as well as removing any next block. Currently, there are no other non-returning functions implemented, but eventually `subdir_done()` will also need to be handled (though `subdir_done()` may present other problems for me).

I also started implementing some neat argument pack based variant argument extractors. There's definately some neat stuff in newer versions of C++, and I'm sure I can come up with a system as nice as meson's typed_kwargs system.

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