Richer instance method

[jcostello]

Describe the project you are working on:
3D shooter

Describe the problem or limitation you are having in your project:
I found myself repeating the following code in order to instance an object to a position inside the scene

var bullet : RigidBody = Bullet.instance() 
bullet.transform = self.global_transform
get_node("/root/World").add_child(bullet)

Describe the feature / enhancement and how it helps to overcome the problem or limitation:
To have a richer instance method that accepts more parameters

var world = get_node("/root/World")
var bullet : RigidBody = Bullet.instance(world, self.transform)

Maybe we can add another parameters that make sense too

Describe how your proposal will work, with code, pseudocode, mockups, and/or diagrams:
See above

If this enhancement will not be used often, can it be worked around with a few lines of script?:
The idea is to reduce duplicated code

Is there a reason why this should be core and not an add-on in the asset library?:
this work only on code

[Calinou]

Duplicate of #1513.

[jcostello]

@Calinou sorry, I didn't found it earlier. My bad