add __DIR__ as an alias to __DIRECTORY__

Signed-off-by: Jimmy Tanagra <jcode@tanagra.id.au>

Author: jimtng

bundles/org.openhab.core.model.yaml/src/main/java/org/openhab/core/model/yaml/internal/util/preprocessor/YamlPreprocessor.java

@@ -152,6 +152,7 @@ private static void addSpecialVariables(Map<String, String> variables, Path file
         variables.put("__FILE_NAME__", fileName);
         variables.put("__FILE_EXT__", fileExtension);
         variables.put("__DIRECTORY__", absolutePath.getParent().toString());
+        variables.put("__DIR__", absolutePath.getParent().toString());
     }
 
     /*