Gracefully parse iCal parameters with colons

According to RFC 5545, iCalendar content lines can have optional
parameters, which can be quoted strings containing colons (":"). Make
sure that such colons are not interpreted as delimiters marking the
start of the value string.

Also, add a test case that covers this corner case.

Reported-by: Håkan Jerning <jerning@home.se>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

test/Makefile.am

@@ -49,6 +49,7 @@ TESTS = \
 	ical-005.sh \
 	ical-006.sh \
 	ical-007.sh \
+	ical-008.sh \
 	next-001.sh \
 	search-001.sh \
 	bug-002.sh \

test/data/ical-008.ical

@@ -0,0 +1,12 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+BEGIN:VEVENT
+DTSTART;TZID="(UTC+01:00) Amsterdam, Berlin, Bern, Rom, Stockholm, Wien":19800101T000100
+DURATION:P1DT9H17M0S
+SUMMARY:Calibrator's
+END:VEVENT
+BEGIN:VTODO
+PRIORITY:1
+SUMMARY:Nary parabled Louvre's fleetest mered
+END:VTODO
+END:VCALENDAR

test/ical-008.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+
+. "${TEST_INIT:-./test-init.sh}"
+
+if [ "$1" = 'actual' ]; then
+  mkdir .calcurse || exit 1
+  cp "$DATA_DIR/conf" .calcurse || exit 1
+  "$CALCURSE" -D "$PWD/.calcurse" -i "$DATA_DIR/ical-008.ical"
+  "$CALCURSE" -D "$PWD/.calcurse" -s01/01/1980 -r2
+  "$CALCURSE" -D "$PWD/.calcurse" -t
+  rm -rf .calcurse || exit 1
+elif [ "$1" = 'expected' ]; then
+  cat <<EOD
+Import process report: 0017 lines read
+1 app / 0 events / 1 todo / 0 skipped
+01/01/80:
+ - 00:01 -> ..:..
+	Calibrator's
+
+01/02/80:
+ - ..:.. -> 09:18
+	Calibrator's
+to do:
+0. Nary parabled Louvre's fleetest mered
+EOD
+else
+  ./run-test "$0"
+fi