Update Nimrod to 0.10.0

Update **Nimrod**, **Jester** and **Nawak** to their latest versions.
- Nawak incorporated its stdlib changes upstream, and is now using and dependent on the nimble package manager and the nim-zmq and nim-uuid package. It was also made compatible with the latest Nim/Nimrod.
- Jester is using its new async (unfortunately there is no scgi support for now).

N.B.: Nimrod the programming language is being renamed Nim when the official 0.10 comes out.
I fixed the code so that we wouldn't have to update all the different
source_code files, so the path is relative to the language folder
(Nimrod here).