suggestions for making the format field ("M", "RM", "MR", etc) more useful

For my project (based on asmdb) it has been very useful to locally rewrite the format field to satisfy the following invariant:

the number of characters in the format field equals the number of operands. This is violated for implicit operands, e.g.:
```
"div"              , "X:<edx>, X:<eax>, r32/m32"                       , "M"       , "F7 /6"
```

My suggestion would be to change the format field to something like: "xxM" where "x" represents an implicit operand.

There also seems to be a problem with these opcodes:

    ["mov"              , "w:r8, ib/ub"                                     , "I"       , "B0+r ib"                      , "ANY"],
    ["mov"              , "w:r16, iw/uw"                                    , "I"       , "66 B8+r iw"                   , "ANY"],
    ["mov"              , "W:r32, id/ud"                                    , "I"       , "B8+r id"                      , "ANY"],
    ["mov"              , "W:r64, iq/uq"                                    , "I"       , "REX.W B8+r iq"                , "X64"],

I believe the format should be ""OI"

asmjit / asmdb

suggestions for making the format field ("M", "RM", "MR", etc) more useful #19