1.28

- Add support for MQTT v5.0 (tested with mosquitto only). Has no advantages over 3.1.1 (but more overhead)
- Move HA/MQTT settings to separate page
- Add MQTT connection state info on HA/MQTT Settings page
- WM: Minor HTML tweaks; make page width dynamic for better display on handheld devices
- WM: Require HTTP_POST for params save pages
- Block BTTFN/MQTT commands while "busy"
- Prevent P1-speed from becoming the reason to switch to adapting to TCD-provided speed in speedo-less time-travel sequences
- Sync'd TT: Handle abort in P0

Author: realA10001986