Fixed #15939 - Added a dedicated property for value used in Windows shell, allowing to provide a custom hotkey.

fixes #12010

Fixes #12063.
This is a complement to #11870.
Removed the "Folder" registry keys, restored the "directory" ones and added the "Drive" ones.

The Windows Explorer context menu "Open with Code" works with files and directories but not with drive roots (C:\, D:\, etc.).
This change in the registry fixes that.

fixes #8687

fixes #7461

fixes #3419