lrclib api option, many improvements and refactoring

Sources/EeveeSpotify/Settings/Shared/ViewModifiers/ListRowSeparatorHidden.swift

@@ -0,0 +1,13 @@
+import SwiftUI
+
+struct ListRowSeparatorHidden: ViewModifier {
+    func body(content: Content) -> some View {
+        if #available(iOS 15.0, *) {
+            content
+                .listRowSeparator(.hidden)
+        }
+        else {
+            content
+        }
+    }
+}