feat(remind): implement alarm rendering for triggers

Remove debug logging from `collect_triggers` and
`separate_master_and_recurrence`, and add full alarm rendering support:
convert `Timedesc.Span.t` triggers to `++n`/`WARN`/`+n`/`SCHED` remind
syntax for both all-day and timed events, with dynamic `FSET` generation
for multiple triggers and annotated `MSG` bodies showing advance notice.

bin/eventPredicates.ml

@@ -111,12 +111,6 @@ let collect_exdates rem ev : (Remind.rem, error) result =
 
 let collect_triggers rem ev : (Remind.rem, error) result =
   let triggers = Utils.get_triggers ev in
-  if List.length triggers > 0 then begin
-    Printf.eprintf "UID: %s\n" (Utils.get_uid ev);
-    ListLabels.iteri triggers ~f:(fun i trigger ->
-        Printf.eprintf "  Trigger %d: %s\n" (i + 1) (Timedesc.Span.to_string trigger));
-    Printf.eprintf "\n"
-  end;
   Ok { rem with Remind.triggers }
 
 let yearly_simple_date rem ev : (Remind.rem, error) result =