Fix regenerate ids on blueprint

[benib]

• fixes regenerate generateId properties on items on blueprint #62
• this refactors the blueprinting like this:
  • do not just copy the data and changing some properties
  • instead generate a new object based on the tools schema
  • all properties that are available on the original object but not defined in the schema will be removed
  • any property that has generatedId as the Q:default will be regenerated based on the new id

This can be tested with our quiz tool (the id of the single questions needs to be regenerated on blueprinting based on the new id).