changed assembler tools

ooooh, felix, what you gonna do?!
fixed signed adding
add enAlu for fuckup

TODO remove it later!
alu c and v calc is currently broken

TODO make it work!
impl push and pop
add bitrange
fixed some things in mk
add __all__ to logic.py
add tristate to r{a,o}m when cs is not set
everything is now vhdl'able

yeah! fuck that shit up!
C und V müssen in der ALU noch berechnet werden.