Use a Trie instead of a HashMap as cache

[iggedi-ig-ig]

Using a Trie instead of a hash map would significantly reduce memory and probably not be slower.
radix_trie implements such a Trie already, though seriailzation for storing the cache would probably have to be done differently.

[CodeMarco05]

@iggedi-ig-ig do you by yourself write in rust. Because I'm currently working on the FileExplorer and the Trie data structure would definitely be a huge improvement. And if you want to work on the feature with me, this would be great.