Add default argument value support

absolute_path.py

@@ -0,0 +1,9 @@
+import os
+
+def absolute_path(component):
+    """
+    Returns the absolute path to a file in the addon directory.
+
+    Alternative to `os.abspath` that works the same on macOS and Windows.
+    """
+    return os.path.join(os.path.dirname(os.path.realpath(__file__)), component)