Return vms_matrix from vm_matrix_x_matrix
Replace vm_copy_transpose_matrix with vm_transposed_matrix

Also, delete obsolete broken inlining support.
Use partial_range with RBAudio
Switch digi_unxlat_sound to throw on error
Reduce reindexing of SoundObjects
Remove unused add_flicker
Fix apply_light_to_segment propagation for unusual connections

30 entries is insufficient.
Compact grs_canvas
Simplify cstring_tie