Related to #1153, implements the first part of the integration, without the
parts that use the runner which will be done next.
Temporarily there are two logger implementations - this will be alleviated with
the next part - when and the direct classpath dependency on the language server
is removed.
Project Manager to stores its metadata inside the project directory,
instead of maintaining the global index. This will allow users to move
and modify files inside the ~/enso directory.
