Makefile

I added the -std=c++17 flag to enable better constexpr support.

Clang Tidy

The compile_commands.json is used by clang-tidy. To generate it from the makefile, use bear: "bear -- make". There are two options that clang doesn't know: -mpreferred-stack-boundary=2 and -mmanual-endbr. These should be removed from the compile_commands.json so clang-tidy won't throw errors for every file.