* zin: add gap property to flex widgets.

lib/zin/wg/col/v1.php

@@ -5,6 +5,7 @@ namespace zin;
 class col extends wg
 {
     protected static array $defineProps = array(
+        'gap?: string|number',
         'justify?:string',
         'align?:string'
     );
@@ -19,6 +20,7 @@ class col extends wg
         return div
         (
             setClass($classList),
+            zui::gap($this->prop('gap')),
             set($this->getRestProps()),
             $this->children()
         );

lib/zin/wg/row/v1.php

@@ -5,6 +5,7 @@ namespace zin;
 class row extends wg
 {
     protected static array $defineProps = array(
+        'gap?: string|number',
         'justify?: string',
         'align?: string'
     );
@@ -19,6 +20,7 @@ class row extends wg
         return div
         (
             setClass($classList),
+            zui::gap($this->prop('gap')),
             set($this->getRestProps()),
             $this->children()
         );

lib/zin/zui/zui.class.php

@@ -203,6 +203,11 @@ class zui extends wg
         return $value ? setClass('disabled') : null;
     }
 
+    public static function gap($value)
+    {
+        return zui::skin('gap', $value, '0', 'gap');
+    }
+
     public static function width($value)
     {
         return zui::skin('w', $value, '0', 'width');