Added `provides_includes` field in `Library` gRPC message (arduino#934)

* Refactored commaSeparatedToList function

* Added 'provides_includes' field in 'lib list' output structures

* Added integration tests for 'provides_includes' field

* Report errors while populating library output

Release 0.13.0-rc1

If installer can't run post_install do not give up (arduino#912)

* Changed core install message

* Removed useless condition (letfover)

* Convert errors running post_install into warnings