feat(emulator): allow overriding pipettes used by smoothie emulator

[amitlissack]

Overview

Users can define which pipettes are loaded by smoothie emulator

Changelog

• Added Settings object to emulator app
• Documented how to override in DOCKER.md
• Document how to override in README.rst
• added commented about override in docker-compose.yml

Review requests

Risk assessment

None

[codecov]

Codecov Report

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[sfoster1]

Looks good to me though I couldn't test because of dev env problems unfortunately but I will update when I can.