- Added headers where they were missing

- Added comments where needed
- Beautified the code where needed, more readable and more compliant to CS
- loadResource function in helper fhc_helper.php is not using anymore CI
- Moved all constants from UDFWidget to UDFLib
- Added constant SORT to UDFLib
- Renamed constant REGEX_LANGUAGE to FE_REGEX_LANGUAGE in UDFLib
- Better formatting and indentation of the code of WidgetLib (more compliant to CS)
- Added missing validation attributes to HTML widgets
- Added constant HTML_DEFAULT_VALUE to CheckboxWidget
- Unset parameter multiple in DropdownWidget constructor
- Changed value of constant REQUIRED in widget HTMLWidget
- Added protected property $htmlParameters to widget HTMLWidget
  (it works as alias to $this->_args[HTMLWidget::HTML_ARG_NAME] -> better code)
- Replaced $this->_args[HTMLWidget::HTML_ARG_NAME] with $this->htmlParameters in the widgets
- Changed the CSS class label[udf-required=true]::after to label[required-field=true]::after in widgets.css
- Better use of constants in UDFWidget: constants from HTMLWidget are used only for the HTML parameters,
  while constants from UDFLib are used only for UDF parameters

application/widgets/udf/TextareaWidgetUDF.php

@@ -1,12 +1,12 @@
 <?php
 
 /**
- * 
+ * It exends the TextareaWidget class to represent an HTML textarea
  */
 class TextareaWidgetUDF extends TextareaWidget
 {
 	/**
-	 * 
+	 * NOTE: echo $this->content() is needed
 	 */
 	public function render($parameters)
 	{