Feature: #72309 - EXT:form - Integration of Predefined Forms

Description

The content element of EXT:form now allows the integration of predefined forms. An integrator can define forms - for example within a site package - using plugin.tx_form.predefinedForms. An editor can add a new mailform content element to a page and choose a form from a list of predefined elements.

There are even more advantages:

Integrators can build there forms with TypoScript which offers much more possibilities than doing it within the form wizard. Especially, the integrator is able to use stdWrap functionality which are not available when using the form wizard (for security reasons).
There is no need anymore for editors to use the form wizard. They can choose the predefined forms which are optimized layout-wise.
Forms can be re-used throughout the whole installation.
Forms can be stored outside the DB and versioned.

In order to be able to select the pre-defined form in the backend, the form has to be registered using PageTS.

TCEFORM.tt_content.tx_form_predefinedform.addItems.contactForm = LLL:EXT:my_theme/Resources/Private/Language/locallang.xlf:contactForm

Example form:

plugin.tx_form.predefinedForms.contactForm = FORM
plugin.tx_form.predefinedForms.contactForm {
   enctype = multipart/form-data
   method = post
   prefix = contact
   confirmation = 1

   postProcessor {
      1 = mail
      1 {
         recipientEmail = test@mail.com
         senderEmail = test@mail.com
         subject {
            value = Contact form
            lang.de = Kontakt Formular
         }
      }
   }

   10 = TEXTLINE
   10 {
      name = name
      type = text
      required = required
      label {
         value = Name
         lang.de = Name
      }
      placeholder {
         value = Enter your name
         lang.de = Name eingeben
      }
   }

   20 = TEXTLINE
   20 {
      name = email
      type = email
      required = required
      label {
         value = Email
         lang.de = E-Mail
      }
      placeholder {
         value = Enter your email address
         lang.de = E-Mail Adresse eingeben
      }
   }

   30 = TEXTAREA
   30 {
      name = message
      cols = 40
      rows = 5
      required = required
      label {
         value = Message
         lang.de = Nachricht
      }
      placeholder {
         value = Enter your message
         lang.de = Nachricht eingeben
      }
   }

   40 = SUBMIT
   40 {
      name = 5
      type = submit
      value {
         value = Send
         lang.de = Senden
      }
   }
}