- Remove Full Render size from VSE preview size. Use just 100% instead
- Add Use Proxies checkbox to control whether proxies are used globally
- Move preview size to top so it is most prominent
- Set default to 100% preview size and use proxies (could be separate patch as well)
Design task: T85469
No change has been done to individual strip setting as users may need to turn proxies on/off individually.
I think it would be best if size selection will be managed when automatic proxy building is enabled. In that case proxy panel can be simplified a lot. This is probalby better to leave for separate patch




