send pr_nimscript_module PR

[timotheecour]

I also have a PR that turns nimscript into an import module (not include file) and allows a nimscript module to skip auto-importing it, which makes nims code more like regular nim code without all the "baggage" like cd, etc. I just need to see how well it fits with nim-lang#14235.

related: as mentioned in nim-lang#14143 (comment)
implicitly exported symols are not good, in particular when they differ from standard nim c behavior
user should import os for these and it'd work via vmops
we should be able to do this without much breakage by introducing a flag --nimsimports:off with semantics:
--nimsimports:off # doesn't import anything, user has to import relevant module (eg os); will be default in some future tag 1.3.X
--nimsimports:on # default until 1.3.x, gives a new warning while it's on