refactor owrx.form -> owrx.form.input

owrx/form/input/wfm.py

@@ -0,0 +1,16 @@
+from owrx.form.input import DropdownEnum
+
+
+class WfmTauValues(DropdownEnum):
+    TAU_50_MICRO = (50e-6, "most regions")
+    TAU_75_MICRO = (75e-6, "Americas and South Korea")
+
+    def __new__(cls, *args, **kwargs):
+        value, description = args
+        obj = object.__new__(cls)
+        obj._value_ = value
+        obj.description = description
+        return obj
+
+    def __str__(self):
+        return "{}µs ({})".format(int(self.value * 1e6), self.description)