Implement Ctrl+S or Command+S for save draft (#1628)

* Implement Ctrl+S or Command+S for save draft

* rename

* add Typecho.savePost

* fix upload file size

* add new uploader

* replace new uploader

* fix textarea change

* fix preview

* refactor post edit

* fix issue

* fix page edit

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Co-authored-by: joyqi <joyqi@segmentfault.com>
Co-authored-by: joyqi <magike.net@gmail.com>

admin/custom-fields-js.php

@@ -20,7 +20,7 @@ $(document).ready(function () {
                     $(this).remove();
                 });
 
-                $(this).parents('form').trigger('field');
+                $(this).parents('form').trigger('change');
             }
         });
     }
@@ -40,10 +40,6 @@ $(document).ready(function () {
                 + '<td><button type="button" class="btn btn-xs"><?php _e('删除'); ?></button></td></tr>',
             el = $(html).hide().appendTo('#custom-field table tbody').fadeIn();
 
-            $(':input', el).bind('input change', function () {
-                $(this).parents('form').trigger('field');
-            });
-
         attachDeleteEvent(el);
     });
 });