v2.0

From v1.0 to v2.0:

full optional pcb emulation
more added heatpump types
stats topic in mqtt
gratious arp to overcome some router issues
many more topics
J series conditions internal heater added
longer username/password
memory usage improvements
code optimizations
wifi configuration now in main code
try reconnect wifi without reboot
restore s0 watthourtotal after reconnect mqtt
fix 50 day uptime mqtt disconnect