Add possibility to use party AND guild for KS setting

Imported from legacy Flarum.
Original author: thecloneranger (Flarum #608)

atm it’s only possible to use either party or guild or friends i think, anyway, could it be possible to add multiple choices to the setting of Kill-Steal parameters like party AND guild for instance that i see that could be used more frequently by some players and if guild alliance work one day that could be incorporated with the guild section maybe?, anyway, a few ideas, feel free to add your points.
Thank you.

Imported from legacy Flarum.
Original author: Muh (Flarum #1)

@thecloneranger We had the options self/party/guild, but we removed all but party which is currently the only option.
Would it hurt to include guild as default?

Imported from legacy Flarum.
Original author: Aqua (Flarum #629)

@Muh the default should be party imo

Imported from legacy Flarum.
Original author: thecloneranger (Flarum #608)

well depends if you hate some of your guild members xD, i don’t mind to combine party and guild at the same, maybe do a poll in discord to know opinion of all on the question since everybody is concerned about it

Imported from legacy Flarum.
Original author: MadMonkey (Flarum #165)

Can’t they both be default options?

Imported from legacy Flarum.
Original author: kaiakaito (Flarum #244)

Moving it to rejected