Improving state serialization/deserialization on DotrainOrderGui

[findolor]

Motivation

See issues #1135 and #1120

Solution

Serialization

• Loop through select tokens list and save token data
• Loop through inputs and outputs and save vault ids

Deserialization

• Make sure token data is in select tokens list. Replace token data with new data
• Update inputs and outputs with new vault ids

Checks

By submitting this for review, I'm confirming I've done the following:

• made this PR as small as possible
• unit-tested any new functionality
• linked any relevant issues or PRs
• included screenshots (if this involves a front-end change)