[core] Added preliminary change log.

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>
[Core] Properly use utf8cpp and Mersennetwister.

This is just a little clean-up to tell the compilers properly we
are using an include not part of the project itself.

Signed-off-by: Daniel S. Reichenbach <daniel@kogitoapp.com>