Implement more display events#710

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Masstronaut wants to merge 2 commits intoFelixKratz:masterfrom

Masstronaut:master

Commits on Apr 7, 2025

stubbed display events. Implemented rough version of add/remove
Masstronaut
committed

Commits on Apr 9, 2025

sends a display_removed event to items assigned to a removed display
Masstronaut
committed