[Feature req] Custom Fields

[Elfangor93]

Description

With the plugins JoomAdditionalImageFields and JoomAdditionalCategoryFields it is already possible to add more information to the images and categories of the JoomGallery.

Since Joomla 3.7 the core has added the custom fields component, which has become very popular in the joomla community. It offers the possibility to add custom information to any content supporting these fields in a similar way as our JoomAdditionalImageFields do. The difference is that joomla users already know how to work with custom fields, whereas with our plugin they have to rely on help.

I think it would be very nice, if the JoomGallery could implement the custom fields from the joomla core.

The implementation of the fields looks very easy regarding the official documentation:
https://docs.joomla.org/J3.x:Adding_custom_fields/Implement_into_your_component

What is to be done

• Add fields and field groups to component backend (context: image)
• Implement necessary ACL
• Add fields to the following form views
  • edit image (frontend & backend)
  • edit images (batch edit - frontend & backend)
• Add triggers for the necessary plugin events to render the fields
  (onContentAfterTitle, onContentBeforeDisplay. onContentAfterDisplay, onContentPrepare)

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