Add unique user identifiers to system chat messages (where applicable)

[Pyromonk]

General Info

• UUID: 74ca0c4c-683d-4012-965a-ba3bc6bb1b13
• Browser and OS: not applicable

Description

System messages (for example, boss_damage and spell_cast_party), as returned by the API's groups/party/chat, do not contain unique user identifiers, which drastically reduces their usefulness. At the moment, the only user identifier they return is info.user, and it's the profile (display) name of a user. In other words, a party could have 2 users (with different usernames and UUID's), both named "John", and there would be no way of telling which of the 2 Johns caused Anti'zinnya to sap everyone's mana.

This is an issue both with the API's dataset and the (web) UI. I realise that one doesn't encounter 2 or more identical profile names particularly often, but it is a possibility.