define result of BYHOUR, BYMINUTE and BYSECOND with all-day start date

[dmfs]

At present BYHOUR, BYMINUTE and BYSECOND can be used with all-day start date and the result is somewhat undefined.
The lib should have a well defined behavior, either ignore or fail. The behavior may depend on the parser mode.

[dmfs]

RFC 5545 is actually quite clear about that:

 The BYSECOND, BYMINUTE and BYHOUR rule parts MUST NOT be specified
 when the associated "DTSTART" property has a DATE value type.
 These rule parts MUST be ignored in RECUR value that violate the
 above requirement (e.g., generated by applications that pre-date
 this revision of iCalendar).