support targetSelector property

[sh-chun74]

Description

• Change the target-selector in the target-class method.

Steps to check or reproduce

AS-IS

// Create eg.Visible instance
var visible = new eg.Visible(document,{
    targetClass : "card",
    expandSize : 0
});

�TO-BE

// Create eg.Visible instance
var visible = new eg.Visible(document,{
    targetSelector : ".card",
    expandSize : 0
});

[qpitlove]

@daybrush
When are you planning to release this feature?

[daybrush]

@qpitlove @SeokHwanChun

visible 2.4.0 is released. targetSelector is added.