split the controllers into separate files

owrx/controllers/api.py

@@ -0,0 +1,9 @@
+from . import Controller
+from owrx.feature import FeatureDetector
+import json
+
+
+class ApiController(Controller):
+    def handle_request(self):
+        data = json.dumps(FeatureDetector().feature_report())
+        self.send_response(data, content_type="application/json")