Install the language server into the Qt Creator resource directory
instead. Reuse the server for all interpreters with the same
version. This also reduces the amount of editor toolbars asking the user
to install a language server for a specific interpreter.
Change-Id: I48ef4ad30fe0097ee8d2b855b0f278e98be5ce57
Reviewed-by: Christian Stenger <christian.stenger@qt.io>