v0.42

- App transistion is now inacitve if there is only 1 app
- Adds bargraph to notify and customapps
- Every awtrix now gets a unique id for AP, MQTT and HA
- Adds firmware as HA sensor
- Adds wifi strength as HA sensor
- Adds ram usage as HA sensor
- Adds version as HA sensor
- Adds uptime as ISO 8601 as HA sensot
- HA discorvery now gets correct device classes
- fixes bug where date formats are not saved

closes #24
closes #23
closes #21

src/Globals.h

@@ -2,6 +2,7 @@
 #define GLOBALS_H
 #include <Arduino.h>
 
+extern const char *uniqueID;
 extern const char *VERSION;
 extern IPAddress local_IP;
 extern IPAddress gateway;