Split the file system into a common part and a wine version part for the UI
The UI downloads a file system for each version of Wine, but apart from the Wine specific files, the file systems are identical. It would be nice if Boxedwine can use 2 zip files for its file system. One will be the base Debian 10 file system and the other will be the Wine specific file, those files that are in /opt/wine
#29 The base file system and the Wine build can now be in separate zip files.