[QoL] display extension's score & members in main AA

[Juuzou]

It would be helpful to see the extensions' members show up in the main alliance's members list (and in the API when fetching members data) along with all the usual data - wars, military, score, etc.
Shouldn't be too hard to code and gives the extension treaty some meaning, as currently it's no different than a MDP/MdoAP.

Little example of how it can look (Damn I love frogs is an extension of Man I love frogs):

[Gatorcock]

So true, this way offshores don't escape initial blitzes 😊