Update IWA TTF properties to v2 and prepare the field for v3

[Neurone]

Problem description

The current implementation of the IWA TTF properties is not updated with the most recent v2 version of the standard.

Also, a new v3 is currently in development and will be probably published in Q4.

In the context of mapping methodologies with the IWA TTF properties correctly, we need to source code to support the current v2 specs, and the future ones.

Requirements

• Introduce a versioning system for the Guardian IWA TTF properties, so that
  • policy developers can define a specific standard to use for the policy (a single spec for each policy).
  • users can recognise what IWA TTF specs version is used by the policy both reading the network for published policies or via importing the .policy file.
• Flag the current implementation as legacy, so all policies non-compliant with the new versioning system will be recognized by the system as following the legacy specs.
• Update the list of properties in the source code.
• Update the documentation to support multiple versions of the specs.

Notes

GitHub permalink to v2 specs.