Date/Time/Datetime fields now can be repeated

Before this release, date/time/datetime fields could not be repeated because each requires a unique taxonomy. This allows for the repetition of these fields. However, usage should be handled with caution. The date field still needs to have a taxonomy associated with it, but it saves no terms under it. The date data is saved in the posts metadata only. Additionally, regular standalone date fields(that aren't repeated) still work the same way as before.

This isn't the best solution, but it's the easiest to implement given the timeframe and backwards compatibility.