refactor the sdr.hu updater into the new server, too

owrx/config.py

@@ -53,6 +53,9 @@ class PropertyManager(object):
         prop.wire(fireCallbacks)
         return self
 
+    def __contains__(self, name):
+        return self.hasProperty(name)
+
     def __getitem__(self, name):
         return self.getPropertyValue(name)
 
@@ -61,6 +64,9 @@ class PropertyManager(object):
             self.add(name, Property())
         self.getProperty(name).setValue(value)
 
+    def __dict__(self):
+        return {k:v.getValue() for k, v in self.properties.items()}
+
     def hasProperty(self, name):
         return name in self.properties
 
@@ -86,6 +92,15 @@ class PropertyManager(object):
                 p.setValue(other_pm[key])
         return self
 
+    def loadConfig(self, filename):
+        cfg = __import__(filename)
+        for name, value in cfg.__dict__.items():
+            if name.startswith("__"):
+                continue
+            self[name] = value
+        return self
+
+
 class UnknownFeatureException(Exception):
     pass