flame-engine / flame

* Adding game to overlaybuilder and visible overlays

* Fixing things

* Format

* Adding Renan's suggestions

* Removing wrongly commited integration test files

* Fixing active overlay when it is null

* Update CHANGELOG.md

Co-authored-by: Jochum van der Ploeg <[email protected]>

* Adding some more changes from suggestions

* Removing unnecessary elvis operator

Co-authored-by: Jochum van der Ploeg <[email protected]>