Change to zElevation property, update projects

To accurately represent changes to the "Z elevation" property in the editor. I have enabled the default C3 SDK "z elevation" support. The original z elevation implementation was done before the formal SDK support for "Z elevation" was implemented, so the Z elevation property was located in the custom "Properties" section of the object in the editor.

The change required is for projects that set the 'Z elevation' property to non zero, instead of using the previous z elevation property located in the "Properties" section, the Z elevation property in the "Common" section should be set instead. The previous value of Z elevation is located under "Properties" under the name "Obsolete" and can be copied to the the "Common" section's Z elevation.

The "z elevation" ACEs should operate the same as they previously did, please report any issues with current projects.