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
This rearranges scene.cpp to a file organization that more closely
follows which code is responsible for what area of (hardware)
initialization.
All TA and CORE register accesses now use the new ta_bits.h and
core_bits.h, respectively.
