Use relative paths or project items for custom test bench VIs

[smithd]

When setting up a custom VI to use as a simulation test bench, you are currently limited to setting a constant path. If you move your VI, send it to another user, change the name, or otherwise change the path of the custom VI, you must enter the FPGA target settings and modify the path. That is, if you moved the project below from user1's desktop to user2's desktop, you would have to enter the properties and change the location. This makes code sharing somewhat tedious.

Using a relative path or a project item would make this feature easier to use.