* merge PR #1056, visualization html
* update MqTT library to 1.4.4
* update RF24 library to 1.4.7
* update ArduinoJson library to 6.21.3
* set minimum invervall for `/live` to 5 seconds
* fix display of hidden SSID checkbox
* changed yield correction data type to `double`, now decimal places are supported
* corrected name of 0.91" display in settings
* attempt to fix MqTT zero values only if setting is there #980, #957
* made AP password configurable #951
* added option to start without time-sync, eg. for AP-only-mode #951
* fix: no MQTT `total` sensor for autodiscover if only one inverter was found #805
* fix: MQTT `total` renamed to `device_name` + `_TOTOL` for better visibility #805
fix add inverter `setup.html` #766
fix MQTT retained flag for total values #726
renamed buttons for import and export `setup.html`
added serial message `settings saved`
reduced maximum allowed JSON size for API to 6000Bytes #660
small fix: output command at `prepareDevInformCmd` #692
improved inverter handling for MQTT #671
webserial minor overflow fix#660
web `index.html` improve version information #701
fix MQTT sets power limit to zero (0) #692
changed `reset at midnight` with timezone #697
added part of mac address to MQTT client ID to seperate multiple ESPs in same network
added dictionary for MQTT to reduce heap-fragmentation
removed `last Alarm` from Live view, because it showed always the same alarm - will change in future
fix blue LED lights up all the time #672
fix installing schedulers if NTP server isn't available
improved zero values on triggers #671
hardcoded MQTT subtopics, because wildcard `#` leads to errors
rephrased some messages on webif, thx to @Argafal#638