Expose property nullProgress for ECC Reference Wallet

[pacu]

BlockProgress struct was missing a public initializer for ECC Wallet's CombineSynchronizer to convert SyncStatus into CombineSynchronizer States.

there was an internal helper but it was not exposed. A static property was made public instead

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[geffenz]

@adamstener can you give us an update on what is done and what isn't (and possibly check the boxes)? I'd like to close this but don't see enough documentation.

[adamstener]

I'm not familiar with what this is

[adamstener]

Looks like ci is failing?