feat: add shadow dom support, fixes #321 #479
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When using angular-editor under a shadow dom encapsulated component, it was throwing errors as it tried to find some elements by their id's using the global document api:

This pull request tries to solve it by changing the way we access those elements using Angular's ElementRef instead of document.
It also adds a new page on the angular-editor-app project to showcase the use of angular-editor under a shadow dom encapsulated component.
Test are passing:
