Feat: [#3157] return target on trigger

[Autsider666]

===:clipboard: PR Checklist :clipboard:===

• [x] :pushpin: issue exists in github for these changes
• [x] :microscope: existing tests still pass
• [x] :see_no_evil: code conforms to the style guide
• [x] :triangular_ruler: new tests written and passing / old tests updated with new scenario(s)
• [x] :page_facing_up: changelog entry added (or not needed)

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Couldn't get the suggested setup to work without adding a lot of extra (code) complexity. I'd recommend dropping that requirement, because it's a lot easier to implement by the developers themselves by adding the check in their own filter callback to assure an entity is of a specific type (and use as .... to placate TS if needed).

I'll finish the last 2 points on the checklist after there's a green light on my current implementation.

Closes #3157

Changes:

• The action callback of Trigger now returns the entity that triggered it.
• General cleanup of Trigger class
  • target is now 100% separate from filter, because that's what the functionality described in the documentation implied (to me).
  • Converted all the different "default value fallbacks" to a single setup.
  • Trigger used Entity and Actor interchangeably. Rewrote it to be 100% Entity (Although Entity doesn't have any collision mechanics build in, so an argument could be made to go for 100% Actor)

[Autsider666]

Ah, those tests have to be fixed. Is there any magic ritual to get the sandbox command to run locally? I was hope sacrificing a chicken was enough, but it'll take a bit to find a goat...

[eonarheim]

Ah, those tests have to be fixed. Is there any magic ritual to get the sandbox command to run locally? I was hope sacrificing a chicken was enough, but it'll take a bit to find a goat...

There indeed is some hidden magic apologies, I've been meaning to fix up the sandbox to a modern build. I've got a half completed stale branch (https://github.com/excaliburjs/Excalibur/tree/chore/improve-sandbox-qol)

The gist is you copy the built artifacts into the sandbox lib folder then run the build

1. Build ex umd module npm run core:bundle
2. Copy ex to lib and build sandbox npm run sandbox:copy && npm run sandbox:build

[eonarheim]

@Autsider666 there are some flakey unit tests on main I haven't nailed down yet either :/

[Autsider666]

@eonarheim Updated the changelog, so PR is ready to be merged

[eonarheim]

@Autsider666 Many thanks!