Advanced PSD import

Hi,

it's great that Rive supports PSD files! Only few tools do that, thank you.

But, I have some improvement ideas for the support, because the way how it works right now, makes that feature unusable for me. Unfortunately.

1. Import layers that have unsupported properties as rasterized images with the look they have in Photoshop

   1. at the moment, all unsupported properties get removed and the readable vector part gets imported

   2. On the left side we see how layers get imported and on the right side how they are designed in Photoshop

      

2. Import pure readable vector shapes as vector shapes

   1. at the moment, they get imported as rasterized images

3. Support 16bit and 32bit color depth

   1. at the moment, when PSDs with a 16bit or 32bit channel gets imported, they cannot be correctly displayed. They appear as groups on the canvas even if the PSD asset preview looks correct