raidboss: update arr and responses to use player objects

[quisquous]

Followup to #5861.

[quisquous]

@valarnin A couple of things this brings up is:

• should data.party.member(undefined) return ??? or should the trigger handle it explicitly (I am leaning towards making the trigger do this work but I guess I can see how awkward this becomes later)
• should output support not only objects but arrays of objects and join them with commas into the final string (I'm not sure about this)

[valarnin]

• should data.party.member(undefined) return ??? or should the trigger handle it explicitly (I am leaning towards making the trigger do this work but I guess I can see how awkward this becomes later)

I see two options here:

1. data.party.member(undefined) returns undefined and the trigger handles it
2. data.party.member(undefined) returns a dummy party member object with all fields set to ???

I'm fine with either one, honestly. The latter option would probably be better to reduce boilerplate in triggers though, and still be detectable if a trigger explicitly needed to check for it?

• should output support not only objects but arrays of objects and join them with commas into the final string (I'm not sure about this)

I think there are a couple of other questions that would need answered first:

1. Is , the most appropriate separator? Does that make sense for all the languages that cactbot supports, or would that need to be localize-able?
2. Should the input string array be join'd directly and then substituted, or should each input string in the array be substituted and then the resultant array be joined, or possibly both with some sort of selector? e.g.:

const inputStrings = ['A', 'B', 'C'];
const outputString = 'something ${value}';

const option1Result = 'something A,B,C';
const option2Result = 'something A,something B,something C';

[quisquous]

• should output support not only objects but arrays of objects and join them with commas into the final string (I'm not sure about this)

I think there are a couple of other questions that would need answered first:

1. Is , the most appropriate separator? Does that make sense for all the languages that cactbot supports, or would that need to be localize-able?

As far as I can tell, this is generally what gets used, e.g. T6 Thorn Whip's twoTethers output string. There are some triggers (see: https://github.com/quisquous/cactbot/pull/5891/files#diff-7796360647af53a46da16de5fff30e73d36d01e87dfa0489475c60354678f905L45) that just insert commas directly (which imo they shouldn't do, but unless output starts returning non-string values, there's not much to be done).

A quick search for /map.*ShortName/ shows ~10 more examples of this (although other different uses of that as well).

I could see an argument that this is ~ok and if it's awkward in a particular language that trigger could handle it specially.

2. Should the input string array be join'd directly and then substituted, or should each input string in the array be substituted and then the resultant array be joined, or possibly both with some sort of selector? e.g.:

const inputStrings = ['A', 'B', 'C'];
const outputString = 'something ${value}';

const option1Result = 'something A,B,C';
const option2Result = 'something A,something B,something C';

I think option1Result is the one that makes more sense. It's usually a "X on a, b, c" or "X with a, b, c".