Change DateTime method args to CalDateTime

[axunonb]

Methods left using DateTime:

Type: Ical.Net.Calendar, Method: AddTimeZone
Type: Ical.Net.Calendar, Method: AddTimeZone
Type: Ical.Net.Calendar, Method: AddLocalTimeZone
Type: Ical.Net.Utility.DateUtil, Method: AsCalDateTime
Type: Ical.Net.Utility.DateUtil, Method: ToZonedDateTimeLeniently
Type: Ical.Net.Utility.DateUtil, Method: FromTimeZoneToTimeZone
Type: Ical.Net.Utility.DateUtil, Method: FromTimeZoneToTimeZone
Type: Ical.Net.Utility.DateUtil, Method: Truncate
Type: Ical.Net.Utility.DateUtil, Method: WeekOfMonth
Type: Ical.Net.DataTypes.UtcOffset, Method: ToUtc
Type: Ical.Net.DataTypes.UtcOffset, Method: ToLocal
Type: Ical.Net.CalendarComponents.VTimeZone, Method: FromLocalTimeZone
Type: Ical.Net.CalendarComponents.VTimeZone, Method: FromSystemTimeZone
Type: Ical.Net.CalendarComponents.VTimeZone, Method: FromDateTimeZone

Closes #703

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
Ical.Net/CalendarComponents/RecurringComponent.cs	33%	2 Missing ⚠️
Ical.Net/VTimeZoneInfo.cs	50%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (40%) is below the target coverage (80%). You can increase the patch coverage or adjust the target coverage.
❌ Your project status has failed because the head coverage (67%) is below the target coverage (80%). You can increase the head coverage or adjust the target coverage.

@@         Coverage Diff         @@
##           main   #761   +/-   ##
===================================
  Coverage    67%    67%           
===================================
  Files       104    104           
  Lines      4517   4508    -9     
  Branches   1106   1103    -3     
===================================
  Hits       3012   3012           
+ Misses     1072   1065    -7     
+ Partials    433    431    -2     

Files with missing lines	Coverage Δ
Ical.Net/Calendar.cs	70% <ø> (-<1%)	⬇️
Ical.Net/CalendarCollection.cs	61% <ø> (+4%)	⬆️
Ical.Net/CalendarComponents/Alarm.cs	16% <ø> (ø)
Ical.Net/CalendarComponents/Todo.cs	66% <ø> (ø)
Ical.Net/Evaluation/EventEvaluator.cs	88% <ø> (ø)
Ical.Net/Evaluation/RecurrencePatternEvaluator.cs	92% <ø> (+<1%)	⬆️
Ical.Net/Evaluation/RecurringEvaluator.cs	92% <ø> (ø)
Ical.Net/Evaluation/TimeZoneInfoEvaluator.cs	20% <ø> (+6%)	⬆️
Ical.Net/Evaluation/TodoEvaluator.cs	62% <ø> (ø)
Ical.Net/VTimeZoneInfo.cs	37% <50%> (+1%)	⬆️
... and 1 more

... and 1 file with indirect coverage changes

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

Ical.Net/VTimeZoneInfo.cs:100

• [nitpick] When a null value is assigned to TimeZoneName, an empty string is added instead. Consider whether this behavior aligns with the intended design or if null should clear the list instead.

TimeZoneNames.Add(value ?? string.Empty);

[minichma]

Great. As so often - the best code is deleted code.

[minichma]

Looking at the getter, null would represent an empty list rather than a list with an empty string as its sole member.