initial extension

[k9ert]

With this PR, spectrum wil get an extension for Specter Desktop. I tried to separate the stuff as best as possible. Spectrum heavy lifting is rarely touched and keep in cryptoadvance.spectrum. All stuff which is specific to the extension is located in cryptoadvance.specterext.spectrum. Namely:

• The service.py specifying currently only one blueprint (ui.py) which is there for configuring the extension
• spectrum_node.py derives from AbstractNode and mainly hands out a BridgeRpc rpc-class which is not doing RPC-calls to a http-endpoint as the usual RPC-class does but internally calling the Spectrum.jsonrpc method

This PR needs the changes in https://github.com/cryptoadvance/specter-desktop/pull/1913 to work.

[moneymanolis]

Many tests are failing because an outdated version of Specter Core is used for the tests: cryptoadvance.specter==1.10.3 is pinned intest_requirements.txt which gets installed by the GitHub actions (see pytest.yml, line 22).

[moneymanolis]

Issues / quirks / bugs (running in "extension" mode not stand-alone)

• [x] No keys available to create wallet (import of wallet possible, though)

  

• [x] Exception thrown if trying to delete a wallet, same when trying to delete a device since this also calls the datadir attribute.

  

Adding below tospectrum_node.py?

@property
def datadir(self):
# Spectrum node has no Bitcoin Core datadir
    return None

• [ ] Error when trying to import the demo onchain multisig wallet:

I suppose the problem is, that there is no working_folder for the wallet_manager:

• [x] Getting this error when importing an existing regtest wallet (raised in wallet_importer.py in line 52):

Features / improvements

Currently, the only visible feeback to see whether the Electrum connection is established / working is the block count at the top left. There should be immediate feedback after "Save" plus a visible icon (as we have in Specter Core) to signal no connection.

No connection:

Connection:

[moritzwietersheim]

I did an initial test on my MacBook Pro M1, of dmg release v1.13.2-pre7 on mainnet. Loads & connects very nicely, without Problems. Loaded my multisig-demo wallet & single-sig demo wallet.

I could prepare an unsigned tx for multisig normally, and could also scan & sign with Specter DIY via QR. When I tried to sign with Trezor One there was no USB signing option.

Still see these Speed-up & Cancel Transaction bug, and doesnt dissappear after some time.

The icon at the top of the status line is somehow distorted.

[k9ert]

This PR is not really sustainable. Change-rate is much faster than review rate. Let's start from scratch and simply merge it.