Add missing timers in timers.c and timers.h
Swift doesn't compile if we use --with-subgrid=EAGLE and --enable-timers. It fails with errors along the lines of
runner_doiact_black_holes.h(225): error: identifier "timer_doself_bh_density" is undefined
TIMER_TOC(TIMER_DOSELF_BH);
I think this is because there are some entries missing in timers.h and timers.c. This merge request adds various black hole related timers in timers.h and timers.c and also adds do_stars_resort in timers.c.