Initial support for multi library, still WIP

src/libs/subsonic/impl/SubsonicId.cpp

@@ -31,6 +31,12 @@ namespace API::Subsonic
         return "ar-" + id.toString();
     }
 
+    std::string idToString(Database::MediaLibraryId id)
+    {
+        // No need to prefix as this is only used at well known places
+        return id.toString();
+    }
+
     std::string idToString(Database::ReleaseId id)
     {
         return "al-" + id.toString();
@@ -70,6 +76,15 @@ namespace StringUtils
         return std::nullopt;
     }
 
+    template<>
+    std::optional<Database::MediaLibraryId> readAs(std::string_view str)
+    {
+        if (const auto value{ StringUtils::readAs<Database::MediaLibraryId::ValueType>(str) })
+            return Database::MediaLibraryId{ *value };
+
+        return std::nullopt;
+    }
+
     template<>
     std::optional<Database::ReleaseId> readAs(std::string_view str)
     {