Escrows + Desktop Localchain

[blakebyrnes]

This PR integrates escrows into the payments for datastore and adds localchain integration to the Ulixee Desktop.

Desktop UX:

• Add accounts (mainchain + localchain)
• Create localchain accounts
• Send funds to another localchain via QR code

Payments:

• Wire up a localchain for payments on both local and server
• Client can connect to a localchain for creating escrows and synching
• DatastoreCore can be setup to create Mainchain votes with escrows closing
• E2E tests with mainchain dockers (or local binaries). Will only run in linux on GitHub actions because of docker limitations there.

Chore:

• Projects Schema/Crypto/Specification are moved into Platform, as that's the only place using them