Replace hashed input UtxoId with pair of (txID,outputIndex)

[rakita]

Change related to spec: FuelLabs/fuel-specs#253

Additionally i run clippy and fixed its warning. And there was one error that clippy gave:

error: written amount is not handled. Use `Write::write_all` instead
   --> src/receipt.rs:866:9
    |
866 |         instance.write(bytes)?;
    |         ^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: `#[deny(clippy::unused_io_amount)]` on by default
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_io_amount

is_empty and `unwrap_or_else are clippy requests (she is very needy).

When this is merged i will go through other projects and fix if there is something broken.

[adlerjohn]

lgtm, but will defer to @Voxelot and @vlopes11

[rakita]

@Voxelot @vlopes11 this is good to go and ready for review

[Voxelot]

I'd like to see a feature branch on fuel-vm and fuel-core with these changes working before merging. That way we don't wind up incrementally publishing fuel-tx as we troubleshoot.

[rakita]

feature branch on fuel-vm and fuel-core with these changes working before merging. That way we don't wind up incrementally publishing fuel-tx as we troubleshoot.

Added a few more things to UtxoId (Copy,LowerHex,UpperHex,FromStr), and integrated new UtxoId into fuel-core here: https://github.com/FuelLabs/fuel-core/tree/utxo_id

[vlopes11]

Couple of nits/discussions

[adlerjohn]

LGTM, deferring to one of @Voxelot or @vlopes11 for 🦀 review

He is on vacation and all nitpicks were addressed in proper maner and approved by Brandon and John.

[rakita]

@adlerjohn @Voxelot i will need you to approve this once again, nothing has changed.