In preparation of the upcoming 0.6.0 release I wanted to fix hls.
It introduces two new plugin packages, which are not on hackage yet.
I remove apply-refact overrides, because current apply-refact versions
are compatible with all ghcs we support, according to their changelog.
I override more of the hls dependencies globally on the whole package
set, to avoid a lot of duplicate compilations. And because @peti changed
my mind about this being a good practice.
hls now uses a released version of ghcide
While we are at it I:
* Disable tests, because I can‘t keep up with the speed hls introduces
more tests that cause trouble in nixpkgs.
* Fix builds of fourmolu and retrie
* Remove the wrapper for hls which is obsolete because of improved
package detection in hie-bios. And added a note that this can be removed
for ghcide soon, too.
