Remove unused code and convert some functions to lamdas/std::fun #262
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All the code in functional.h should be able to be replaced by the C++11 constructs. This first PR is more just demonstration, removing unused functions and replacing a couple of the lesser-used ones to ensure a) these patterns are something you're good with and b) before the changes need to happen across a ton of different files. If you're good with the changes, I'd be happy to put all them in this PR, or create multiple medium-sized ones, etc, whatever you'd prefer.