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This also changes bit-shifting semantics, shifting left and then right
instead of the other way around.
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The main type of the library is now the BedrockEmulator type, which
contains a new BedrockCore type and an instance of a user-implemented
DeviceBus trait.
This new structure makes it possible to hot-swap a device bus while
a BedrockEmulator is running, which keeps the core and the device bus
well separated. This was important when bedrock-pc was going to have
two graphical emulator types and upgrade from one to the other once
the screen device was accessed.
The new structure also vastly simplifies the code previously required
with the old Bedrock type, which was parametric over 16 device types
and so needed each device type to be enumerated in every place the
Bedrock type was stored. The new BedrockEmulator type is only
parametric over the particular DeviceBus implementation.
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The macros are for reading and writing individual bytes of unsigned
values, and for testing bitfields.
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The core Bedrock struct is now parametric over individual Device
structs, rather than over a single DeviceBus. This change was made so
that devices can be implemented separately to one another.
The implementation of the evaluate method has also been changed to make
it potentially slightly more efficient, by replacing pop-then-push
combinations with get operations.
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