Update styles and add task priority feature

- Changed border color from #eee to #cdcdcd in various CSS files including dropzone, mapplic, summernote, grid, and select2 to enhance UI consistency.
- Added a new task priority selection feature in the task popup, allowing users to change the priority of tasks dynamically via AJAX.
- Implemented AJAX functionality to handle task priority changes and update the task list accordingly.

libraries/framework/admin-tools/admin-forms/css/admin-forms.css

@@ -110,7 +110,7 @@
   Form Dividers
 ================================================= */
 .admin-form .spacer {
-  border-top: 1px solid #eee;
+  border-top: 1px solid #cdcdcd;
   margin-top: 10px;
   margin-bottom: 10px;
   display: block;
@@ -1794,7 +1794,7 @@
 }
 .ui-timepicker-div dl {
   text-align: left;
-  border: 1px solid #EEE;
+  border: 1px solid #cdcdcd;
   border-width: 1px 0 0 0;
   padding: 15px 10px;
   margin: 0;

libraries/framework/admin-tools/admin-forms/less/elements.less

@@ -115,7 +115,7 @@
   Form Dividers
 ================================================= */
 .admin-form .spacer { 
-  border-top:1px solid #eee; 
+  border-top:1px solid #cdcdcd; 
   margin-top: 10px;
   margin-bottom: 10px;
   display:block;

libraries/framework/admin-tools/admin-forms/less/plugins.less

@@ -251,7 +251,7 @@
     padding: 10px;
  }
  
-.ui-timepicker-div dl { text-align: left; border:1px solid #EEE; border-width:1px 0 0 0; padding:15px 10px; margin:0; }
+.ui-timepicker-div dl { text-align: left; border:1px solid #cdcdcd; border-width:1px 0 0 0; padding:15px 10px; margin:0; }
 .ui-timepicker-div dl dt { float: left; clear:left; padding: 0 0 0 5px; }
 .ui-timepicker-div dl dd { margin: 0 10px 20px 40%; }
 .ui-timepicker-div dl .ui_tpicker_hour,