Adds an appid field to printstatus which can be used to monitor the currently active application.
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printf("%s title %s\n", m->wlr_output->name, client_get_title(c));
title = client_get_title(c);
appid = client_get_appid(c);
printf("%s title %s\n", m->wlr_output->name, title ? title : broken);
printf("%s appid %s\n", m->wlr_output->name, appid ? appid : broken);