feat: Add time to task bar

- Add app.js to windows screen
- Add time display to task bar
- Add new TimeDisplay class to app.js
- Add play and pause buttons as example
- Fix event handlers of task bar according to bubbling and propagation

source/style/modules/ui/_windows_module.scss

@@ -37,6 +37,10 @@ $padding_half: calc(#{hippie.$space_half} - 3px) hippie.$space_half;
 	button {
 		@extend .button_io;
 		overflow: hidden;
+
+		* {
+			pointer-events: none;
+		}
 	}
 
 	nav.small {