Profiler API common function names conflict with other libraries

[kevswims]

Since the core API in https://github.com/yse/easy_profiler/blob/develop/easy_profiler_core/include/easy/profiler.h is inside an extern "C" block, any functions declared that match the function names of another library will cause linking to fail.

In our particular case, the now and version functions are conflicting with the same functions in libsystemd.

There is a PR here https://github.com/yse/easy_profiler/pull/188 that covers some of these functions but not the now() function.

The posted PR looks like it would fix our issues if the now() function was also renamed. Is there anything blocking that PR or another approach that should be taken to fix this?