Start converting some enum-like strings to proper enums, plus global reformat

core/enums.py

@@ -11,6 +11,13 @@ class Continent(str, Enum):
     AN = "AN"
 
 
+class ModeType(str, Enum):
+    PHONE = "PHONE"
+    CW = "CW"
+    DATA = "DATA"
+    UNKNOWN = "UNKNOWN"
+
+
 class ModeSource(str, Enum):
     """Where the mode data came from in a spot."""