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.
Merge remote-tracking branch 'github/pr/1'
Simplify the version 1.0 check in available properties