[NUI] Fix some SVACE issues.

[zhouhao02]

Description of Change

1.CreateValuesVisitor.cs
ArgumentNullException can be thrown inside invocation NameScope.SetNameScope(value as BindableObject, node.Namescope)
WID:14930967 Value value as BindableObject, which was created by as-operator, so can be null, is dereferenced in method call NameScope.SetNameScope()
line 207: NameScope.SetNameScope(value as BindableObject, node.Namescope);
2.DirectRenderingGLView.cs
buffer size may be 0
textures.Count may be 4194241
element byte size may be 8
WID:14929477 Writing textures.Count elements of type System.IntPtr into buffer unmanagedPointer can exceed its size
line 194: System.Runtime.InteropServices.Marshal.Copy(texturesArray, 0, unmanagedPointer, textures.Count);

API Changes

• ACR:

[xuelian-bai]

looks good to me

[xiaowei-guan]

LGTM

[huayongxu]

lgtm

[AchoWang]

Looks good to me.

[hyue7]

looks good

[elishateng]

LGTM

[dongsug-song]

@bshsqa
@tscholb
@huiyueun
@hinohie

Hello,
please review this.
there is chipmunk 3D graphic releated changes.
thank you.

[hinohie]

Hello. Fixed code is kind of debug option. And other 2 kind of patches looks no problem.