Refactor command history to remove node dependencies from engine

[AndreasArvidsson]

Checklist

• [/] I have added tests
• [/] I have updated the docs and cheatsheet
• [/] I have not broken the cheatsheet

[pokey]

update from meet-up:

• Instead of inheritance, CommandHistory receives an interface for reading and writing history entries
• In file-system-common, we implement file-based entry storage

[AndreasArvidsson]

@pokey Updated and ready for review again

[pokey]

see my commit; added some docstrings