Add transform methods for PoolVector*Array

[Xrayez]

Added array version of Vector2 transforms in 2D and Vector3 in 3D.

PoolVector2Array and PoolVector3Array were the only missing Variant types in both Transform2D and Transform respectively.

This should simplify use cases where the points needs to be transformed in batch, and it's not limited to drawing.

This should also help polygon transformations to aid boolean operations: #28987. I'd like to remove exposed transform_points_2d there which was included for the same reason if this gets merged (I wasn't aware of this feature myself).

It's going to become as easy as:

points = Transform2D(0, Vector2(100, 100).xform(points)

Instead of:

var points_transformed = []
var trans = Transform2D(0, Vector2(100, 100)
for p in points:
	points_transformed.append(trans.xform(p))

Test project

xform-pool-vector-array.zip

[bojidar-bg]

Might be nice to update Transform2D in the C# bindings, and probably to add a similar feature to 3D as well.

[Xrayez]

Upon a glance, C# bindings don't seem to have Rect2 transforms either.

As for 3D, seems relatively easy to add, since it would just wrap those Vector3 transforms without me having to learn 3D math!

[Xrayez]

Similar enhancements done for 3D (literally almost copy-pasted), seems to work but I don't have extensive knowledge in 3D to test this more thoroughly.

[akien-mga]

Thanks!