Also adds the incomplete modifier_volume example.
This also adds vec2 for UV coordinates, and obj_to_cpp has been
modified to parse vertex texture coordinates from obj files.
On an emulator, the receive buffer is filled with the correct/expected
data for 'device status'.
I found this experiment useful:
- it revealed a bug in my register struct generator code (the
maple_if-related registers were not at the correct offsets)
- it validates my understanding about endianness-swapping between the
maple bus and the SH4
