Use more strict definition for created as the datetime a package was created

[peterdesmet]

Data package created is currently defined as:

The datetime on which this was created.

Note: semantics may vary between publishers — for some this is the datetime the data was created, for others the datetime the package was created.

In my opinion we should have a less dubious definition and have "This" should refer to Data Package. This is in line with the other definitions:

• "... who contributed to this Data Package"
• "The raw sources for this data package"
• "A URL for the home on the web that is related to this data package."
• "An image to use for this data package."

So created should be the datetime on which this Data Package was created. It can be generated by any software that creates a Data Package.

Regarding backwards compatibility, I don't think there will be many drawbacks (package will still validate), but a note vs v1 might be good.

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"The datetime the data was created" is imo better expressed as a temporal scope, which also allows a start and end date. In Camtrap DP we use Dublin Core's temporal for this: https://camtrap-dp.tdwg.org/metadata/#temporal