Implement bitfield/script

[rokostik]

This PR implements most of the functions in bitfield/script. It's missing some functions that would be hard to implement in Rye as well as the web stuff.

I've prefixed all the functions with p.
p-new-... creates a new pipe and p-... is a function on a pipe.

[refaktor]

Uh, wow ... a lot of work done. Good idea about the MakeNativeArgError! I will try testing it with various use cases and see about the naming. I will see if we need to make explicit distinction between functions that create pipes and the ones that consume them. Thanks a lot for adding these!