[5.x] Support dotted keys in data get

[edalzell]

Would be nice to be able to $entry->get('parent.child')

[jesseleite]

Maybe $entry->set() can handle dot notation too? ❤️

[edalzell]

Maybe $entry->set() can handle dot notation too? ❤️

Not really cuz $this->data is a collection not an array so dotted keys don't work. If someone needs it we can figure it out then.

[duncanmcclean]

If we're going to add dot notation support in ->get(), I think we need to add it across the other methods in ContainsData too.

Otherwise, it might be confusing if you can do this...

$entry->get('venue.address');

But you can't do this:

$entry->has('venue.capacity');
$entry->increment('venue.capacity');
$entry->set('venue.address', '123 Test Lane');
$entry->modify('venue.address', function ($address) {
    //
});
$entry->remove('venue.capacity');

[edalzell]

Not worth the effort