Beautify DTP

- Allow hover animation travel below 0%
- Allow hover animation zoom below 100%
- Hover highlighting independent of hover animation
- Custom color for hover highlighting
- Custom color for mouse down highlighting
- Icon background with rounded corners
- Customize margin for app icons towards screen border and desktop

appIcons.js

@@ -218,7 +218,7 @@ export const TaskbarAppIcon = GObject.registerClass({
 
             this._fullscreenId = Utils.DisplayWrapper.getScreen().connect('in-fullscreen-changed', () => {
                 if (
-                    global.display.focus_window?.get_monitor() == this.dtpPanel.monitor.index && 
+                    global.display.focus_window?.get_monitor() == this.dtpPanel.monitor.index &&
                     !this.dtpPanel.monitor.inFullscreen
                 ) {
                     this._resetDots(true);