* fixed#11, WiFi password length limit increased to 63, check 802.11i spec:
> A pass-phrase is a sequence of between 8 and 63 ASCII-encoded characters. The limit of 63 comes from the desire to distinguish between a pass-phrase and a PSK displayed as 64 hexadecimal characters.
* fix: RF24 power setting configuration
* added RF24 isChipConnected
* added MQTT port configuration
* fix offsets for HM400 and HM600 inverters
* added warning if configuration was changed without reboot
* html / css files are now located inside PROGMEM
* conversion of files is done with python script (OS independent, open source)
* moved as much as possible for now to the hm* modules - the app should only be the body
* successfully tested with HM1200
* build CRC over settings, only if the CRC matches settings are applied
* send command 0x80 (set time was wrong)
* improved crc16 routine
* added statistics for received commands and send statistics (channels are not correct for now!)
* receive of commands 0x01, 0x02, 0x03, 0x81 and 0x84 working