add OMCPath to the public interface (#396)

Author: syntron

OMPython/__init__.py

@@ -15,6 +15,7 @@
     ModelicaSystemError,
 )
 from OMPython.OMCSession import (
+    OMCPath,
     OMCSession,
     OMCSessionCmd,
     OMCSessionException,
@@ -35,6 +36,8 @@
     'ModelicaSystemDoE',
     'ModelicaSystemError',
 
+    'OMCPath',
+
     'OMCSession',
     'OMCSessionCmd',
     'OMCSessionException',