Add the ability to make peer-specific commands using public keys

This allows us to use commands on peers who may be using nicks with strange
or unsupported unicode characters

src/groupchat_commands.h

@@ -45,3 +45,4 @@ void cmd_unmod(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[M
 void cmd_whois(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE]);
 
 #endif  /* GROUPCHAT_COMMANDS_H */
+