Properly handle EXR layer name for Blender 3.6 preview

[TzuChieh]

Now testing the newest version of Blender (3.6), bpy.types.RenderLayer now requires a specific set of layer names for F12 previewing.
This commit ade13a0 temporarily handles this, with several problems observed and need to be addressed:

• The EXR writer (write to memory) interface is ugly, begin able to use byte buffer stream would be nice (the output size is not known beforehand)
• Stream class for socket transfer. Decide whether to keep asio or use Steam's socket.
• Investigate how to make F12 preview react faster in Blender. Currently the image shown seems to lag behind actual progress.
• Able to configure the port and IP to use. Now it hard-coded as localhost:7000.