Use a per-extension menu so extra functionality can be accessed from
one place.
- The install/upgrade button remains top-level.
- "Uninstall" and "Visit Website" have been moved into the menu.
- Theme extensions can be set from the menu.
- Installed add-on extensions have a "View Details" menu item
to switch to the add-ons view (useful to access preferences).
Based on design by Pablo & Dalai.
Co-authored-by: Pablo Vazquez <pablo@blender.org>
Co-authored-by: Dalai Felinto <dalai@blender.org>
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