Add a ProtocolInfo class that is specialized (through inheritance) for
each protocol. This class currently has the protocol's name and any
protocol-specific options (partial_func_reads is the only one so far).
Note that the SLICC language has been updated so that you can specify
the options in the `protocol` statement in the `.slicc` file.
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
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