lib/db: Refactor to use global list by version (fixes #6372) (#6638)

Group the global list of files by version, instead of having one flat list for all devices. This removes lots of duplicate protocol.Vectors.

Co-authored-by: Jakob Borg <jakob@kastelo.net>

lib/api/api.go

@@ -1635,7 +1635,7 @@ func (f jsonFileInfoTrunc) MarshalJSON() ([]byte, error) {
 	return json.Marshal(m)
 }
 
-func fileIntfJSONMap(f db.FileIntf) map[string]interface{} {
+func fileIntfJSONMap(f protocol.FileIntf) map[string]interface{} {
 	out := map[string]interface{}{
 		"name":          f.FileName(),
 		"type":          f.FileType().String(),