1.8.0: Added target frame rate and PlayerPrefs.Delete to toolbar

- Added: Tooltips on all buttons and labels in toolbar tools
- Added: Target frame rate with `[min;max]` slider in toolbar
- Added: `PlayerPrefs` delete button added to toolbar
- Added: Option to select Single/Additive scene load/unload to scene picker
- Added: All `IToolbarSettings` will be grouped with a foldout-toggle in Preferences

Editor/Toolbar/Tools/Settings/ToolbarPlayerPrefsSettings.cs

@@ -0,0 +1,26 @@
+using UnityEditor;
+
+namespace Module.NavigationTool.Editor.Toolbar
+{
+    internal sealed class ToolbarPlayerPrefsSettings : IToolbarSettings
+    {
+        public string Title => "Player Prefs";
+        
+        private const string PREF_PLAYER_PREFS_ENABLED = "ToolbarSettings.IsPlayerPrefsEnabled";
+        
+        public static bool IsPlayerPrefsEnabled
+        {
+            get => EditorPrefs.GetBool(PREF_PLAYER_PREFS_ENABLED, false);
+            set => EditorPrefs.SetBool(PREF_PLAYER_PREFS_ENABLED, value);
+        }
+        
+        public void Initialize()
+        {
+        }
+
+        public void Draw()
+        {
+            IsPlayerPrefsEnabled = EditorGUILayout.Toggle("Enable Player Prefs", IsPlayerPrefsEnabled);
+        }
+    }
+}