ENH: new platform.wsl property for detecting WSL

fsl/utils/platform.py

@@ -321,6 +321,15 @@ class Platform(notifier.Notifier):
         return os.environ.get('FSLDEVDIR', None)
 
 
+    @property
+    def wsl(self):
+        """Boolean flag indicating whether we are running under Windows
+        Subsystem for Linux.
+        """
+        plat = builtin_platform.platform().lower()
+        return 'microsoft' in plat
+
+
     @property
     def fslwsl(self):
         """Boolean flag indicating whether FSL is installed in Windows