Clean actors and update to spec

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Spec has changed quite a bit so refactoring to match
  • Reorganized and exported the actor modules instead of exporting each type from the root level (more contained access because the amount of types was getting to be a lot)
• Implemented serde traits for state which is defined already and was not implemented or incorrectly implemented

These changes will make it a lot easier for any of the actors to be worked on in isolation and not require conflicts when working in parallel. I tried to clean up and setup as much as possible, but did not go very in depth on purpose. I just made sure what exists isn't still from outdated spec or misleading.

Edit: Also implements account actor. I was going to make that seperate but it required more changes to the other actors than itself so didn't make sense to have these changes be reverted in next PR

Reference issue to close (if applicable)

Closes #261

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