Move I/O interfaces into deno_std

[ry]

Like Reader, Writer - everything in https://github.com/denoland/deno/blob/master/js/io.ts

[zekth]

I'll do it.

Into /std/io/??.ts ? There is no mod.ts, do i create one which just expose interfaces? Or do interface.ts ? Or maybe ioutil.ts?

[bartlomieju]

@ry do you still want to do it?

[ry]

@bartlomieju We need to solve the problem of importing stuff from deno_std first. When I created this issue I had forgotten it wasn't passible yet.

[bartlomieju]

Update Feb 24, 2020; closing as it will come up when vetting std