WIP: fix subTargets

fix bug + add test

`_searchPossibleTargets` => `fintTargetsTraversal`

Update CHANGELOG.md

migrate test

migrate findTarget tests

t

Update eventData.test.ts

a real fix

a real fix

fix

fix

f

Update StackedObject.ts

fix

hovering state

cleanup

Update canvas_events.js

hovering state

Update Canvas.ts

consume drag tests

event stream tests

better tests

add textarea tests

adaptions

Revert "WIP: fix subTargets"

This reverts commit 806116cefcbd1d62d2775bb36a79fe642a7cbbfe.