psxpaul and Akin909 Fix for #2414 - truncated copy/paste (#2515)
This is a fix for some of the issues raised in #2414. One thing to note - there was some question as to whether win32yank works for everyone. I did find a possible workaround for that, if it's still an issue:

```
const textToPaste = clipboard.readText()
const sanitizedTextLines = replaceAll(textToPaste, { "'": "''" })
await neovimInstance.command("let @+='" + sanitizedTextLines + "'")
```

I don't have a windows box to test this on, so perhaps we can add this code to `NeovimEditorCommands. pasteContents` later if needed.
Latest commit e482ae8 Aug 27, 2018