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.

scss/style/bar/menu.scss

@@ -2,3 +2,7 @@
   color: if($bar-buttons-monochrome, $bar-buttons-icon, $bar-buttons-dashboard-icon);
   font-size: 1.3em;
 }
+
+.style2 .bar-menu_label {
+  padding: $bar-buttons-padding_y $bar-buttons-padding_x;
+}