Templatize blocks to increase performance

[thomas]

I'm not sure this is worth complicating the code, but I did an
experiment where I turned some unchanging parameters of costas loop
and turned them into template parameters.

With other minor "caching of function calls" it seems to speed up by
about 5%. Nothing like https://github.com/gnuradio/gnuradio/pull/3076.


What's the best way to benchmark this for some A/B testing? I could
share my ugly code that gave me ~5%, but if there's something better
I'd rather use that.

I'm mostly posting this in the spirit of publishing negative results.

Commits:
https://github.com/ThomasHabets/gnuradio/commit/fa1bbccfa6bab21f2e8c21af1e3f33b94bba4528
https://github.com/ThomasHabets/gnuradio/commit/7e0cb2b8263b7890a4307724ac5e6386fb175b32

Branch:
https://github.com/ThomasHabets/gnuradio/tree/costas-template

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