Add the ability to generate design-time data

[mrlacey]

NEEDS FULLY SPECIFYING

Manually creating design-time data is more effort than it feels like it should be.

• What can be done to make it easier, automate it, or generate it?

• How to make it realistic? (i.e. names look like names, etc.)

• Is this a generation or analysis feature? (or both?)

• Does it make sense for all properties/types? (For working with complex types/grids/arrays is the most appealing option here.)

• Can suggesting this for specific types/properties be useful?