add a `generic` module for x86 disassembly

this module generally attempts to decode as 64-bit x86 instructions, on
the assumption they are the most likely-desired instructions, falling
back to 32-bit and then 16-bit decoding, in order.

translation from a 64-bit `long_mode::Instruction` to
`generic::Instruction` is close to free, where
`protected_mode::Instruction` and `real_mode::Instruction` may be a
little more costly in time but should still not be too bad.

docs still need much touching up. most docs reference the `long_mode`
structures and enums they're strongly inspired by.

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