Added 3 new styles for bar buttons. (#168)

* Added a new style called split for bar buttons

* Added wavy button styles.

* Added padding configuration

* Update bar padding

* Fix styling for battery style2

* Fix icon only setting for bar

* Update types and options

* Add button style to exported theme props.

* Fix top margin for menus.

lib/types/bar.d.ts

@@ -0,0 +1,9 @@
+import { Variable } from "types/variable";
+
+export type Child = {
+    component: Box<Gtk.Widget, unknown>;
+    isVisible?: boolean;
+    isVis?: Variable<boolean>;
+    boxClass: string;
+    props: ButtonProps;
+};