Binary Field shouldn't load all base64 data when the object data is loaded

In the current implementation, the data of a binary field (the base64 text) is load when the object is loaded.

This mean when you open a form view with a binary field the file is download and store in the browser memory.

For huge file 30MO you can start to feel it and bigger, the web become really slow.

The data of the binary field should be downloaded only when the user click on the link or on save as