* [fix] get only valid role images
* [up] add post delete signals for device roles
* [fix] move signal registration in `apps.py`
* [fix] register signals in plugin config & filter valid role images
* [fix] undo role image filter as it is wrong and unnecessary
* [up] revert formatting with black
* [up] add config for custom images, better js
* [up] use bundler to bundle js
* [fix] remove domcontentloaded since defer is used
* [fix] formatting with black
* [fix] images drf api
* [up] add support for custom icons on additional roles: power panel, power feed, circuit
* [up] optimize topology generation by using `_id` when trying to access pk of related object
* [fix] kebab case instead of slugification
* [fix] use empty queryset in api views & change coord save logic
Victor Gorchilov