Sync rescript-editor support to commit 214d220.

- Fix type shown when hovering on record fields (see #52), and doc comments for records.
- Fix issue where type variables are printed with global renaming when hovering or autocompleting a module (see rescript-lang/rescript-editor-support#38).
- Fix issue where a log file was always created (see #47).
- Add support for hover on the id of toplevel module definitions (```module Id = ...```).

Author: cristianoc