Add (exemption) extension list

[Character95]

Describe your suggested feature

When you add more then one repo source for extension you have some old extensions that still work but is not in new source and some old duplicate extensions

Other details

To exempt from install or update remove one of duplicated extension from default extension list preferably older version Add or remove from list even if both are installed

Acknowledgements

• [X] I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• [X] I have written a short but informative title.
• [X] I have updated the app to version 0.16.3.
• [X] I will fill out all of the requested information in this form.

[airisama019]

I also want this