Refactor the built-in procedure blocks to use the new procedure data models

[BeksOmega]

Problem Statement

For the procedure data models to actually be useful, we need the procedure blocks to use them. Otherwise we just have a vestigial data system with no "views" of the data.

Proposed Solution

See: https://docs.google.com/document/d/1n4MxZQu49mniC7aUtZ1X4xvwWgpL3st4aDU25pwdaNc/edit#heading=h.n4x8mdlhlyyp

[BeksOmega]

I'm going to be tackling this over several steps:

• Reorganize the procedure blocks to use JSON + Extensions so that it is easier to override / extend / manage individual parts of the blocks' functionality.
• Make procedure definitions hold an internal ProcedureModel which they update.
• Update the procedure definitions to actually update themselves based on their ProcedureModel rather than their current properties.
• Update procedure serialization to get / create ProcedureModels
• Get rid of the old non-ProcedureModel code.

Then I'll want to do a similar thing for the procedure call blocks.