Ridvan non changing wallet

[rozaydin]

No description provided.

[rozaydin]

This PR contains a new parameter for wallet creation staticAddress which controls change and receive address derivation of the default acccount. If this parameter is set to true. Account always uses same receive address and change addresses for it's transactions.

Below sample code shows how new param is used:

const fixedAddressWallet = await wdb.create({ staticAddress: true });

One important thing to note is, to store state (in leveldb) we are now using the last bit of flags byte in Account object.

let flags = 0;

    if (this.initialized)
      flags |= 1;
    if (this.staticAddress)
      flags |= 0x80;

PR modifies the wallet-http endpoints for wallet and account creation to pass new parameter. When interacting with HTTP interface.

[turbomaze]

We want the change addr to be static too, I'll push a commit to replace this with 0, 0 if there's nothing else

[rozaydin]

it's already static and we have tests for it to verify. The parameter 1 on the getSpecificKey is for branch (1 -> changes)
am i missing sth ?