audiolabs/DEISM: Performance optimization

Numba is now supported for image generation in shoebox rooms, this can be called directly by adding deism.params["shoeboxImageCalcVersion"] = "v2-numba" before deism.update_source_receiver() Numba is used to replace Ray in the parallel computaion of each transfer function of the image. This brings the following benefits: More than 10 times acceleration. No computer freezing when shutting down Ray Now the image generation process can use coarser data precision to alleviate the high RAM consumption. However, the image generation in the convex branch is still quite slow when the following parameters are high Spherical harmonic order Frequency points Reflection order