[#3667] Add grouping to initiative tracker

[arbron]

Adds automatic grouping to the initiative tracker. This will group any combatants with the same initiative and the same base actor into a group.

Groups are displayed as collapsible sections in the combat tracker that use the name from the base actor's prototype token. It lists the number of combatants in the group, and when one of the group members is active it displays how far through the group that actor is.

Currently only offers the one grouping mode, but could be expanded in the future to support different grouping such as splitting it into "friendly" and "hostile" groups.

Also works in V13:

Closes #3667

[krbz999]

This will group any combatants with the same initiative and the same base actor into a group.

What about:

• TokenDocument#disposition
• PrototypeToken#actorLink
• TokenDocument#name

It's quite common to use a generic monster for a one-off NPC. Steve the Quest Giver Goblin the party rescues from a cage surely shouldn't be grouped with the rest of them.

[arbron]

This will group any combatants with the same initiative and the same base actor into a group.

What about:

• TokenDocument#disposition
• PrototypeToken#actorLink
• TokenDocument#name

It's quite common to use a generic monster for a one-off NPC. Steve the Quest Giver Goblin the party rescues from a cage surely shouldn't be grouped with the rest of them.

We could take disposition & actor link into account (probably never group if actor link is true), but we wouldn't want to use the token name otherwise adding numbers or adjectives like the goblins in the screenshots above would prevent them from ever being grouped.

[MaxPat931]

Is this intended to work best with flat initiative per #4812 or are there plans for streamlining the process of setting init values for a group, re:

The DM makes one roll for an entire group of identical creatures