Updated projects to TDS v5.1

Whitespace removal in code gen.
Explicit project node references.
Updated default items in core to 8.0

Just minor updates to the serialized items in the core database, so they
match what is installed in Sitecore by default.
Renamed Marketing Center to Marketing Control Panel

This is a change made in Sitecore 8.
Also updated here was the Login and Register items 'updated' fields to
include 'Z' for the new DateTime format.