Remove "stdbool.h" and replace `bool`, `true` and `false` with `uint8_t`, `1` and `0`, respectively?

[felselva]

I was thinking about doing this along with https://github.com/felselva/mathc/issues/29, but this is not very critical and I if a lot of people has objections with it, I would keep the way it currently is. Otherwise, we get rid of stdbool.h and the library will only require stdint.h. 👍 for yes, 👎 for no.

No votes, I will assume yes.