Tab deletion handle and clicking outside to close pop-ups, menus, etc.

[SergioCasCeb]

For this PR, I have implemented the following:

• When a user tries to close a tab/editor, a new prompt is shown to allow the user to confirm if they would actually like to close the tab. This has the purpose of avoiding closing tabs accidentally. (This should help solve issue #495 )
• The user can now close the settings menu, the save menu, and the yaml pop-up warning by clicking outside the main element.
• Unnecessary variables and lines of code in regard to the AAS AID functionality were also removed

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