* Refactor the ASN get date logic to combine shared code.
* Added new API `wc_GetDateInfo` to get raw date, format and length.
* Added new API `wc_GetCertDates` to extract certificate before/after dates as `struct tm` type.
* Added new API `wc_GetDateAsCalendarTime` which parses the raw date string and convers to `struct tm`.
* Added tests for new API's.
* Added missing tests for `wc_SetAltNames`, `wc_SetAltNamesBuffer` and `wc_SetDatesBuffer`.
* Fixed build for older `NO_TIME_H` macro.