Depends on D11888

As per T2599, this is part of a stacked diff to sign utxos for non-eToken txs by matching wif to address.

This diff deprecates the normalizeSlpBalancesAndUtxos function that adds the wif attribute to each UTXO object and updates update() in useWallet.js to simply set newState.slpBalancesAndUtxos to the slpBalancesAndUtxos object directly.

Cashtab is also canvassed end to end to ensure no lingering usages of utxo.wif.

npm test
grep -r '.wif' src/ and verify no output relating to the '.wif' attribute in XEC UTXOs. (ignore unrelated keyword matches in mocks)
send and receive XEC txs
send and receive token txs
send and receive encrypted messages
send and receive unencrypted messages
send and receive one to many XEC txs
send and receive one to many XEC txs with a message
burn token
retest above with a freshly created wallet