add new fields on message snapshot

[Lexedia]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context.

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Connected issues & other potential problems

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Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• Ran dart analyze or make analyze and fixed all issues
• Ran dart format --set-exit-if-changed -l 160 ./lib or make format and fixed all issues
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

[abitofevrything]

MessageManager.parse should be changed to grab the new fields from the message snapshot.