Add disassembly support for ARM/AArch64

[gabrielesvelto]

We can use the yaxpeax-arm crate for that. I wonder if we can abstract the disassembly support using yaxpeax-arch so we don't need to keep two distinct paths for the x86 and ARM architectures (at least until we have to deal with the actual instructions).

[luser]

It's probably a bit out-of-date at this point, but a while ago I tried switching my disasm crate from capstone to yaxpeax-arch. It was pretty straightforward, feel free to use this code as reference if it's helpful:
https://github.com/luser/rust-disasm/blob/c7ffc6fddcbfabe01c96682cd8933331af83e4f5/src/lib.rs#L277-L416