cuekit and cuenorm: three subtitle formats, one cue stream

parity/cases/cuenorm/plain.srt

@@ -0,0 +1,11 @@
+1
+00:00:01,000 --> 00:00:03,000
+The mill stood at the northern end of the valley.
+
+2
+00:00:03,000 --> 00:00:05,500
+Its wheel was undershot, which was wasteful.
+
+3
+00:00:05,500 --> 00:00:09,250
+Nobody replaced it for two hundred years.