Add a parameter prefix for generated procs

[data-man]

Also numbering of parameters is corrected.

[Araq]

Tests are still red.

[data-man]

The redness of the tests is not related to this PR.

[dom96]

I've locked the compiler dependency to ensure it works for the latest stable Nim release and devel.

You should be using nimble now to compile c2nim: nimble build inside the c2nim directory (or nimble c file.nim if you want to compile other files).

[data-man]

Tests are green.

[data-man]

The gentle ping.