Reduce features used on remote filesystems

This attempts to detect remote filesystems on Linux using the
/proc/self/mountinfo file and checking the filesystem against a
hardcoded list of remote filesystems. Remote filesystems will not
thumbnail, read file data to determine mime types, or calculate
directory sizes.

src/operation/mod.rs

@@ -963,7 +963,7 @@ impl Operation {
                             op_sel.selected.push(new_dir.clone());
 
                             let controller = controller.clone();
-                            let mime = mime_for_path(path);
+                            let mime = mime_for_path(path, None, false);
                             let password = password.clone();
                             match mime.essence_str() {
                                 "application/gzip" | "application/x-compressed-tar" => {