Fix properties when the vcalendar is version 1.0, and add specific known properties for version 1.0.

Fix properties when the vcalendar is version 1.0, and add specific known properties for version 1.0.

lib/Data/ICal/Entry.pm:
* added line to _parse_data_ical_generic to set vcal10 mode.

lib/Data/ICal/Entry/Event.pm:
* modified optional_unique_properties and optional_repeatable_properties for version 1.0 properties.

lib/Data/ICal/Entry/Todo.pm:
* modified optional_unique_properties and optional_repeatable_properties for version 1.0 properties.

t/12.verson1.t:
* new file to test version 1.0 calendars.

t/ics/version1.ics:
* new file to support above tests.