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feature #546 Improved the way associations are displayed/handled (javiereguiluz)

This PR was squashed before being merged into the master branch (closes #546).

Discussion
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Improved the way associations are displayed/handled

This fixes #539 and any other issue related to associations with entities that don't define the usual `__toString()` method. This is the new behavior:

1) Common case: backend displays a link to the "show" view of the target entity.

2) If the target entity is not managed by EasyAdmin, its string representation is displayed without a link.

3) If it's a collection of values, we show the count of elements (as we do now).

The main change is in how we determine the string representation of an associated value:

1) If the target entity has a `__toString()` method, we display `(string) $value`

2) If the target entity has a `getId()` method, we display `Name_of_class #ID` (e.g. `Category #20`)

3) Otherwise, we display the name of the class (e.g. `User`)

Commits
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7be2b8b Improved the way associations are displayed/handled

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