Removing unused headers and functions

[ghenry]

Some of these includes can be deleted, but I'm presuming the unused functions are for users of the library?

We could clear these warnings by using them in a test cases if possible.

[GrumpyOldTroll]

Yes, test cases that use these is I think the right action for those functions.

Was there a file for the unused includes? Pretty sure those are needed in some cases, but I believe it if it's saying they're present in some places they're not needed.

[ghenry]

Things like cppcheck and clang-tidy find these which CLion uses: https://www.jetbrains.com/help/clion/code-inspection.html https://www.jetbrains.com/clion/features/code-analysis.html