Various minor cleanups + adding GitHub Actions CI (no coverage yet) #67
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These are all the changes I've had to make to get things to compile when submoduled
into https://github.com/TokTok/c-toxcore. Since cmp isn't a library that gets installed,
it is compiled with the same strict compiler flags as the rest of the code.
Feel free to cherry-pick commits or do things differently. I'll be maintaining my fork
until upstream compiles with all the warning flags we use.