Allow using lv_icon.vi in resource/plugins in parallel to the built in version.

[danyallard]

As a LabVIEW user I want to use lv_icon.vi for my own Icon Editor and be able to call the built in version from my Icon Editor. As it was for the legacy Icon Editor by passing an error code (1) to the numeric output.

I already do that with my icon editor

I can call the legacy and the built in and optionally the OpenGDS IE if it's installed on my dev machine.