Fix showing of CSP files in project folders

[isc-bsaviano]

This PR fixes #1406 and fixes #1407

[isc-bsaviano]

@gjsjohnmurray Everything looks fine to me now. Please let me know if you're still seeing issues.

[gjsjohnmurray]

My Show1407 project now expands correctly in Explorer view.

However the second part of my procedure at #1407 (comment) (creation of New1407 project) still results in an incorrect project definition. The XML export of it looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<Export generator="IRIS" version="26" zv="IRIS for Windows (x86-64) 2024.1 (Build 267_2U)" ts="2024-07-24 15:25:48">
<Project name="New1407" LastModified="2024-07-24 15:23:58">
  <Items>
    <ProjectItem name="show1407" type="PKG"></ProjectItem>
  </Items>
</Project>
</Export>

It seems that the Add Items to Project... step incorrectly creates a ProjectItem of type PKG when I selected the folder named show1407. Notice that the name attribute of the bad ProjectItem is lowercase, which is why our VS Code views fail to expand the classes that are in the Show1407 package.

[isc-bsaviano]

Should be good now