This is mainly to ease the usage of memory access functions, meaning
leaner access of memory with general resulution of memory accesses via
the MemoryIndex struct.
Previously, the displacement for a MemoryIndex was directly interpreted
and saved as a signed value.
Change this to the normal unsigned ImmediateOperand version to allow
for more flexible usage of this struct for general memoryaccess (future
commit) and just interpret the displacement member as signed, only when
being interpreted as such (memory access, display, ....
It's not possible to know if a word or byte is requested, or rather
it would be a pain to retrieve that information.
It is much easier to just read a full word and then discard the top
half, if just a byte is needed.
Previously pointer parsing was completely wrong.
Now split into Pointer32 for immediates with
segment;offset and Pointer16 for short jumps, which
use DS or ES as segment and the Pointer16 value
as offset.
a.out padds the text section with 0-bytes, which where interpreted
as 0x00 0x00 instruction and occasionally as a single 0x00 byte. Add
logic to ignore single 0x00 bytes and to remove dangling 0x00 0x00
instructions at the end of the instruction vec, so only the 'actual'
instructions are presented in the end. Also adjust visibility of
methods, so only the truncated instructions will ever be presented.
Of course, this could remove an actual `0x00 0x00` instruction from the
end, but they would not have any effect on execution anyway.
