[FEATURE] Safe on Server

**Is your feature request related to a problem? Please describe.**

My problem is that I cannot start the work on any my devices and seamlessly continue the work on another.

**Describe the solution you'd like**

A way to safe my progress on the server.

**Additional context**

Partially related to: https://github.com/drawdb-io/drawdb/issues/58

Also instead of having a fully user feature you can just create an "account" that will provide you with a sync token that can be used to access your saves.

The issue does not name any files, tests, or entry points. Read the related issue #58 first, then clarify the server-save, account or token, and cross-device sync requirements; the work is done when a defined save can be accessed from another device.

Written by the indexing model from the issue text.