So this is my first try to implement the "Load Byte" instruction.
Unfortunately im not so sure if all of the stuff i do is sequential or if i should put the sign extension into the
combinational logic.
Also im very unsure if this works at all.

id_opcode_class is another thing i dont get.

all other output signals should be mentioned.
some changes after i got what id_ex_a and id_ex_b are