Implement Powerplay 2.0 into state

[dvdmuckle]

Describe the enhancement

Presently, it doesn't look like information on Powerplay 2.0 is available to plugins through the state interface. This information, such as what power you're pledged to and how many merits you have, is part of the Startup event and is emitted on logging into the game. Having this information would allow plugin developers to craft a couple plugins around Powerplay 2.0, the simplest of which could display how many merits you have at launch, so players can compare to how many merits they have in game (merit earning is not presently reported as an event sadly) when constructed reports on PP2.0 operations.

Expected behavior

Add to the state interface a subsection where one can query for Powerplay 2.0 information, as documented here: https://elite-journal.readthedocs.io/en/latest/Startup/#powerplay

Considered workarounds

I can't think of any workarounds to this at the moment, but I can take a crack at implementing this and submitting a PR.

Additional context

If it wasn't obvious, I'm looking to craft a plugin that will report the number of merits one has when they start the game. It doesn't look like that's currently possible with EDMC.

[dvdmuckle]

I created a PR to address this, I'm fairly certain I got everything covered, including updating Inara.