New source toolbar, cleanup other toolbars and help window

Split Metrics and Source editor as two separate toolbars. Removed keyboard shortcut for metrics and sticky note. Ensure log notification are visible.

src/Settings.h

@@ -32,6 +32,9 @@ struct WidgetsConfig
     int  shader_editor_view;
     bool toolbox;
     bool help;
+    bool source_toolbar;
+    int  source_toolbar_border;
+    int  source_toolbar_mode;
 
     WidgetsConfig() {
         stats = false;
@@ -52,6 +55,9 @@ struct WidgetsConfig
         shader_editor_view = -1;
         inputs = false;
         inputs_view = -1;
+        source_toolbar = false;
+        source_toolbar_mode = 0;
+        source_toolbar_border = -1;
     }
 };