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/clock.scss

@@ -1,3 +1,7 @@
 .clock {
   color: if($bar-buttons-monochrome, $bar-buttons-text, $bar-buttons-clock-text);
 }
+
+.style2.clock {
+  padding: $bar-buttons-padding_y $bar-buttons-padding_x;
+}