Create better unique identifiers for saved forms

[chrissainty]

Currently, we just use a string Id provided by the user. This isn't unique enough to be used application-wide. We need to come up with a better way to generate this Id, perhaps something like the hash of the object type and the user provided id?

[dotnetspark]

@chrissainty would you consider guid for ids?

[chihabhajji]

i havent looked at the code base, but the id combined with the navigator uri postfix and typeof(Model) should do the trick,