* Always download files into cache
Previous implementation would skip downloading the file if no new hashes were requested. Issue is that the curseforge and modrinth exports require the file contents. Not retrieving the file violates these assumptions. Instead of creating new parameters to force a file download, I changed the code to simply always download instead. This seems like reasonable behaviour for a cache. This fixes#296
* Bump cache index version, delete potentially broken files from old version
Added support for importing manual files and rehashing where necessary
Moved cache folder to "local" user folder
Cleaned up messages, saved index after importing
