Remove std::string as the model id and use decoder enum. (#1143)

* Remove std::string as the model id and use decoder enum.

* Update decoder version

* Check model id is in decoder range when launching discovery.

* Add BLEconnect enum MIN/MAX

main/config_BT.h

@@ -168,7 +168,18 @@ struct BLEdevice {
   bool isWhtL;
   bool isBlkL;
   bool connect;
-  std::string sensorModel_id;
+  int sensorModel_id;
+};
+
+class BLEconectable {
+public:
+  enum id {
+    MIN = 1000,
+    LYWSD03MMC,
+    MHO_C401,
+    DT24_BLE,
+    MAX,
+  };
 };
 
 JsonObject& getBTJsonObject(const char* json = NULL, bool haPresenceEnabled = true);