implement adding and removing scheduler slots

htdocs/css/admin.css

@@ -98,6 +98,7 @@ table.bookmarks .frequency {
 
 .removable-group.removable .removable-item {
     flex: 1 0 auto;
+    margin-right: .25rem;
 }
 
 .removable-group.removable .option-remove-button {

htdocs/lib/settings/SchedulerInput.js

@@ -1,6 +1,8 @@
 $.fn.schedulerInput = function() {
     this.each(function() {
         var $container = $(this);
+        var $template = $container.find('.template');
+        $template.find('input, select').prop('disabled', true);
 
         var update = function(value){
             $container.find('.option').hide();
@@ -13,5 +15,19 @@ $.fn.schedulerInput = function() {
             update(value);
         });
         update($select.val());
+
+        $container.find('.add-button').on('click', function() {
+            var row = $template.clone();
+            row.removeClass('template').show();
+            row.find('input, select').prop('disabled', false);
+            $template.before(row);
+
+            return false;
+        });
+
+        $container.on('click', '.remove-button', function(e) {
+            var row = $(e.target).parents('.scheduler-static-time-inputs');
+            row.remove();
+        });
     });
 }