Stores bochscpu breakpoints in a dictionary.

[0vercl0k]

This changes how bochscpu stores breakpoints to match how other backends do it. It's also bad for performance to iterate over all the breakpoints every time - I think the thought initially was to support multiple breakpoints on the same instruction but I ended up never really using this / implementing this in other backends.

On top of that a few other fixes:

• Warn the user if you actually end up setting a breakpoint on a location that already has one,
• Add a dummy fuzzer module which is useful to load a dump from a friend to debug it,
• Add a link to the fuzzing-ida75 repository / doar-e article,
• Add cr2/cr3 in get / set register for the backends.