RFC5445 simple client implication in go

see https://tools.ietf.org/html/rfc5545

todo list:

• Value Types
  • Binary
  • Boolean
  • Calendar User Address
  • Date
  • Date-Time
  • Duration
  • Float
  • Integer
  • Period of Time
  • Recurrence Rule
  • Text
  • Time
  • URI
  • UTC Offset
• Property Parameters
  • Alternate Text Representation
  • Common Name
  • Calendar User Type
  • Delegators
  • Delegatees
  • Directory Entry Reference
  • Inline Encoding
  • Format Type
  • Free/Busy Time Type
  • Language
  • Group or List Membership
  • Participation Status
  • Recurrence Identifier Range
  • Alarm Trigger Relationship
  • Relationship Type
  • Participation Role
  • RSVP Expectation
  • Sent By
  • Time Zone Identifier
  • Value Data Types
• Component Properties
  • Descriptive Component Properties
    • Attachment
    • Categories
    • Classification
    • Comment
    • Description
    • Geographic Position
    • Location
    • Percent Complete
    • Priority
    • Resources
    • Status
  • Date and Time Component Properties
    • Date-Time Completed
    • Date-Time End
    • Date-Time Due
    • Date-Time Start
    • Duration
    • Free/Busy Time
    • Time Transparency
  • Time Zone Component Properties
    • Time Zone Identifier
    • Time Zone Name
    • Time Zone Offset From
    • Time Zone Offset To
    • Time Zone URL
  • Relationship Component Properties
    • Attendee
    • Contact
    • Organizer
    • Recurrence ID
    • Related To
    • Uniform Resource Locator
    • Unique Identifier
  • Recurrence Component Properties
    • Exception Date-Times
    • Recurrence Date-Times
    • Recurrence Rule
  • Alarm Component Properties
    • Action
    • Repeat Count
    • Trigger
  • Change Management Component Properties
    • Date-Time Created
    • Date-Time Stamp
    • Last Modified
    • Sequence Number
  • Miscellaneous Component Properties
    • IANA Properties
    • Non-Standard Properties
    • Request Status
• EVENT
• TO-DO
• JOURNAL
• FREE/BUSY
• TIME ZONE
• Calender
• Error-check

Usage:

	//       BEGIN:VCALENDAR
	//       VERSION:2.0
	//       PRODID:-//hacksw/handcal//NONSGML v1.0//EN
	//       BEGIN:VEVENT
	//       UID:19970610T172345Z-AF23B2@example.com
	//       DTSTAMP:19970610T172345Z
	//       DTSTART:19970714T170000Z
	//       DTEND:19970715T040000Z
	//       SUMMARY:Bastille Day Party
	//       END:VEVENT
	//       END:VCALENDAR
	c := Calendar{
		ProdId:  property.NewProductIdentifier("-//hacksw/handcal//NONSGML v1.0//EN"),
		Version: &property.Version2,
		Components: []components.Component{
			&components.Event{
				DtStamp: changemanage.NewDtStamp(1997, 6, 10, 17, 23, 45),
				Uid:     relationship.NewUid("19970610T172345Z-AF23B2@example.com"),
				DtStart: datetime.NewDateStartWithDatetime(1997, 7, 14, 17, 0, 0),
				Summary: descriptive.NewSummary("Bastille Day Party"),
				DtEnd:   datetime.NewDateTimeDateEnd(1997, 7, 15, 4, 0, 0),
			},
		},
	}
	calendar, _ := c.Calendar()
	fmt.Println(calendar)