Feature Request: Modular Field Groups/Templates?

[st4rdog]

I'm looking for a way to group some fields (which could include relationship fields) together so I can re-use them modularly in different contenttypes.

Use case: Video game release date related to a console, e.g. here on the right.

Pseudocode:

VideoGame
{
    string name;
    ReleaseDateOnConsole[] releaseDates; // ui_enabled: true
}

Console
{
    string name;
}

// This is not a contenttype, just a modular field group for use in contenttypes.
ReleaseDateOnConsole
{
    Console console;
    Date date;
}