ExportAlignData generates an exception in build

[LeCommandeur]

Hi,

I recently tried to build the latest commit and found that when executing the code on a VIVE XR Elite device, the application cannot run properly as when the method ExportAlignData in SpatialManager.cs and MarterManager.cs generates an exception due to the fact that it is run on a separate thread.

I can comment the call to the method ExportAlignDataAsync to force the code to run on the main thread. It hangs the app for a short while but works though a proper fix would be appreciated. The problem happens when allocating the AlignData class and passing a transform that cannot be accessed outside the main thread.

Thank you in advance.