N°803 - Allow display & edition of attributes on n:n relations on Portal

- Remove input when object is in view mode
- Improve form errors handling
- Prevent row selection when clicking input 
- Attach date time picker to table instead of input to prevent popup truncating (popup will be visible but not aligned on the input)

lib/composer/ClassLoader.php

@@ -149,7 +149,7 @@ class ClassLoader
 
     /**
      * @return string[] Array of classname => path
-     * @psalm-return array<string, string>
+     * @psalm-var array<string, string>
      */
     public function getClassMap()
     {