Enabling Built-In Data Types tests for Azure Table Storage. Added a
non-null property to all Built-In data types classes to support having a
PartitionKey and RowId for Azure Table Storage.
Making WithCurrentCulture have the same signature on all platforms allowing it to unify.
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Stop generating values for properties for which a value has been set.

We currently check against the default value for the property type; I will file an issue for allowing this check to be specified, which would then also allow it to be disregarded entirely such that this behavior is switched off.