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

docs/mqtt.md

@@ -29,7 +29,7 @@ Built-in app names are:
 - `hum`
 - `bat`
 
-For custom pages, use the name you set in the topic. For example, if `[PREFIX]/custom/test` is your topic, then `test` is the name.
+For custom apps, use the name you set in the topic. For example, if `[PREFIX]/custom/test` is your topic, then `test` is the name.
 
 ## Change Settings  
 Change various settings related to the app display.