Ability to cache downloads
Generating an image or SD card with pibox is a very long process which can be reduced for those who use it multiple times. While most pibox users are probably on very fast internet connections, those who are not can not use pibox.
Users should be able to:
- enable/disable a cache for downloads
- specify the location of that cache ; just like the build one.
- empty/trash it whenever they want to.
- Ideally specify some kind of filter (max xxGB or only files greater than 30GB, etc)
UI should be explicit enough so that they understand it is only useful for reusing the same content afterwards and would consume a lot of additional disk space.
Ref.: #90.