more .h includes simplification

[dimitre]

This PR removes some includes from ofConstants.h and include by demand where needed.
includes are:

#include <stdint.h>
#include <cstdio>
#include <cstdlib>
#include <string>
#include <cstring>
#include <iostream>
#include <vector>
#include <memory>
#include <functional>

We can add them to ofMain.h to assure they are still added on projects

Linux action runner is failing because of libgconf-2-4

[dimitre]

good to go. should we re-add includes in ofMain.h to keep all of them available ?