Feature request: Invert (not) node

[dy-sh]

Implement logic invert (not) node

[kellers76]

a "not" looks after the restart of singlehub so that inputs and outputs are false and the "not" does not work.

if both inputs are true then the output is false

but now if the inputs go back to false, then the output remains false again

In my example, I put a signal on both inputs, because I want to invert only one sinal.