[7.x] Added makeVisibleIf and makeHiddenIf

[rennokki]

What I want to achieve is to show/hide certain attributes based on other model attributes.

For example, hiding home_lineups and away_lineups for a sport event if they don't have lineups.

$sportEvent->makeHiddenIf(function ($sportEvent) {
    return ! $sportEvent->has_lineups;
}, ['home_lineups, 'away_lineups']);

Or, vice-versa, having them hidden by default and showing them:

$sportEvent->makeVisibleIf(function ($sportEvent) {
    return $sportEvent->has_lineups;
}, ['home_lineups, 'away_lineups']);