Unique global identifiers on a per-entity basis.

[drewmccormack]

The CDEEventBuilder class currently uniques global identifiers across all entities. It would be better to unique on a per-entity basis.

Eg. It is conceivable that a Tag class might have a global identifier the same as its text (e.g. Car). Another entity may have a similar approach, and a conflict on the global identifier is likely to occur.

[drewmccormack]

Fixed in 70cfddc