[purs ide] Reads files in TextMode for adding imports (purescript#2850)

The functions provided in System.IO.UTF8 use ByteString's readFile, which uses
https://hackage.haskell.org/package/base-4.9.1.0/docs/System-IO.html#v:openBinaryFile
under the hood, which in turn causes trouble when we treat source files as text
on Windows.

0.11.3

0.11.2

0.11.1

Improve error when using old-style context (purescript#2773)

Add useful errors for removed kind syntax (purescript#2760)

* Add useful errors for removed kind syntax

* Use parserFail for kind syntax hints

* Tweak kind syntax hint wording

0.10.7

0.10.6

Merge pull request purescript#2522 from LiamGoodacre/update/orphan-de…

…tection

Update orphan instance check to use covering sets