Option to lock snakview elements

Locking allows disabling elements from out of the claimlistview. The property input element
may now be disabled when adding a new claim to an existing claim section while not having to
disable the input element when adding a completely new claim.

Change-Id: I25b654c79f58f9eb2dc5dfdf0741e98b8c7665a5
Merge "Option to lock snakview elements"