MQTT topics refactoring (sub-properties, set) to better compatibility, modify default topic prefix from /myhome to myhome

lighthub/item.h

@@ -19,6 +19,17 @@ e-mail    anklimov@gmail.com
 */
 #include "options.h"
 
+#define S_SET 1
+#define S_TEMP 2
+#define S_MODE 3
+#define S_SETPOINT 4
+#define S_POWER 5
+#define S_VOL 6
+#define S_HEAT 7
+#define S_CSV 8
+#define S_RGB 9
+#define S_RPM 10
+
 #define CH_DIMMER 0   //DMX 1 ch
 #define CH_RGBW   1   //DMX 4 ch
 #define CH_RGB    2   //DMX 3 ch