Evaluate some tests failing from the libical test suite.

[minichma]

When running a list of test cases from the libical project, the following tests fail. The reason should be investigated.

• DTSTART:20120101T120000, RRULE:FREQ=YEARLY;BYYEARDAY=-366;COUNT=3
  Values differ at index [1]
  Expected: <01.01.2016 12:00:00 UTC>
  But was: <31.12.2012 12:00:00 UTC>

• DTSTART:20121231T120000, RRULE:FREQ=YEARLY;BYYEARDAY=366;COUNT=3
  Values differ at index [1]
  Expected: <31.12.2016 12:00:00 UTC>
  But was: <01.01.2014 12:00:00 UTC>

• DTSTART:20121231T120000, RRULE:FREQ=YEARLY;BYYEARDAY=366;UNTIL=20200101T000000
  Values differ at index [1]
  Expected: <31.12.2016 12:00:00 UTC>
  But was: <01.01.2014 12:00:00 UTC>

• DTSTART:20130101T000000, RRULE:FREQ=YEARLY;BYWEEKNO=1,2,-1,-2;BYDAY=TU;UNTIL=20170101T000000Z
  System.ArgumentOutOfRangeException : The added or subtracted value results in an un-representable DateTime. (Parameter 'value')
  DateTime.ThrowDateArithmetic(Int32 param)
  DateTime.AddTicks(Int64 value)
  RecurrencePatternEvaluator.GetWeekNoVariants(List1 dates, RecurrencePattern pattern, Nullable1 expand) line 425

• DTSTART:20141006T090000, RRULE:FREQ=WEEKLY;INTERVAL=1;COUNT=2;BYDAY=MO;
  Fixed in Fix some recurrence evaluation issues #645
  System.IndexOutOfRangeException : Index was outside the bounds of the array.
  RecurrencePatternSerializer.Deserialize(TextReader tr) line 244

• DTSTART:20161229T090000, RRULE:FREQ=WEEKLY;UNTIL=20170127T000000Z;WKST=MO;BYDAY=SU,TU,TH;INTERVAL=2
  Fixed in Fix some recurrence evaluation issues #645
  Expected is <System.Collections.Generic.List1[Ical.Net.DataTypes.CalDateTime]> with 6 elements, actual is <System.Collections.Generic.List1[Ical.Net.DataTypes.IDateTime]> with 7 elements
  Values differ at index [1]
  Expected: <10.01.2017 09:00:00 UTC>
  But was: <03.01.2017 09:00:00 UTC>

• DTSTART:20180206T080001, RRULE:FREQ=YEARLY;BYWEEKNO=6;BYDAY=TU;WKST=TH;UNTIL=20210612T000000Z
  Expected is <System.Collections.Generic.List1[Ical.Net.DataTypes.CalDateTime]> with 4 elements, actual is <System.Collections.Generic.List1[Ical.Net.DataTypes.IDateTime]> with 3 elements
  Values differ at index [0]
  Expected: <13.02.2018 08:00:01 UTC>
  But was: <06.02.2018 08:00:01 UTC>

• DTSTART:20241018, RRULE:FREQ=DAILY;BYMINUTE=1,2,3,4;INTERVAL=2;COUNT=3
  Fixed by RRULE evaluation: Ignore BYtime if DTSTART is date-only #619
  Expected is <System.Collections.Generic.List1[Ical.Net.DataTypes.CalDateTime]> with 3 elements, actual is <System.Collections.Generic.List1[Ical.Net.DataTypes.IDateTime]> with 3 elements
  Values differ at index [0]
  Expected: <18.10.2024 UTC>
  But was: <18.10.2024 00:01:00 UTC>

Also see #617

[axunonb]

This is a brilliant source to improve the code (and a brilliant idea, of course).