Fix bugs #12447 and #12326 with infloop causes by idle timers, update docs.

 src/keyboard.c (timer_check_2): Move calculation of 'timers' and
 'idle_timers' from here ...
 (timer_check): ... to here.  Use Fcopy_sequence to copy the timer
 lists, to avoid infloops when the timer does something stupid,
 like reinvoke itself with the same or smaller time-out.

 lisp/emacs-lisp/timer.el (run-with-idle-timer)
 (timer-activate-when-idle): Warn against reinvoking an idle timer
 from within its own timer action.

 doc/lispref/os.texi (Idle Timers): Warn against reinvoking an idle timer
 from within its own timer action.

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