AddressRepeater now takes the range it should repeat over, which only
really affects its reported size.
AddressAdapter is now AddressRightShifter, which is literally the operation
it performs, where the input is still the bits to shift the address right by
It turns out to not be too much of a performance issue to allocate
a new frame each time one is produced, so to reduce lock contention
I added a queue where frames are added to and taken from without
locking the frame for the whole update. I'm hoping this will give
more flexibility to frontend implementations, which can simply
skip or repeat frames if needed.
I wanted to make this a bit more modular, so it's easier in theory to
write external crates that can reuse bits, and selectively compile in
bits, such as adding new systems or new cpu implementations
