Eagerx-gui

Fix

* Qt6 bug ([`2adcd4b`](https://github.com/eager-dev/eagerx_gui/commit/2adcd4b6333fa2e2d833aa4d80946a871b63376a))
* Gymnasium support ([`d983dc6`](https://github.com/eager-dev/eagerx_gui/commit/d983dc6a7bf69b3ec727c39697b6ce5b86405d69))

Fix
* Graph refactor ([`6756fe3`](https://github.com/eager-dev/eagerx_gui/commit/6756fe3cbcf161630fbca7355ffb51d33963ac20))

Fix
* Open menu upon right click ([`d1a3226`](https://github.com/eager-dev/eagerx_gui/commit/d1a3226d31d8abbcf23fc031cd80ba4dbf75e042))

Fix
* Make object states red ([`7f8ab7b`](https://github.com/eager-dev/eagerx_gui/commit/7f8ab7b89fe8c82145ed726036396619a10a2008))

Fix
* Improve node positioning ([`c0972a2`](https://github.com/eager-dev/eagerx_gui/commit/c0972a2903a275397a8492cb5dc165570cd58ccc))

Fix
* Atexit quit caused problems with rendering, so it is removed ([`267db81`](https://github.com/eager-dev/eagerx_gui/commit/267db810e9532acc88a606257b3d37a8dc5c5fb6))