Update URL parsing to reflect spec updates

[lyoshenka]

Blocked by lbryio/lbry-sdk#2832. Feel free to do this work anytime, but don't merge or deploy it until this is done in the SDK.

We're changing the # (the claim ID char) in URLs to be :, and the : (claim sequence char) to be *.

# will still work for now, but its deprecated. The SDK should accept it and just convert it to : internally. Everything coming out of the SDK should use :

Here are the corresponding spec changes: lbryio/spec@500066a

[tiger5226]

We don't currently have this column yet. I definitely want to add it, but I might as well add this format. Since no one is using the column it's probably not blocked.