Prototype Registry: Replace numeric Agent.id with PK

[jcowman2]

Description

• Changes Agent.id from being a number to being a PK<Agent>.
• Adds a few methods to PK and PKProvider.

Checklist

Change Type

• Bug Fix
• New Feature
• Refactor (changes code but not behavior)
• Non-code Change (documentation, dependencies, etc.)

Is this a breaking change?

• No
• Yes

If yes, describe what exactly this change breaks:

Agent.id is no longer a number. It is now a PK<Agent>. This doesn't change any external behavior, but since Agent.id is part of the public API, it is technically breaking.

Unit Tests

• Tests Added
• Tests Modified
• No Change

Documentation

• In-code Docs
• API Reference
• Other (Specify: )
• No Change

Related Issues

Issue Number	Action	Notes
#104	Partially Implemented

Further Action

Description	Issue Number
Use the PK system in the remaining indexed classes	#104
Update API reference to reflect prototype registry changes	#105

[coveralls]

Pull Request Test Coverage Report for Build 318

• 85 of 85 (100.0%) changed or added relevant lines in 15 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 313:	0.0%
Covered Lines:	981
Relevant Lines:	981

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💛 - Coveralls