R2111

• full IPv4/IPv6 dual stack integration for devices >= 4MB flash
• complete new integration with LWIP stack
• new DNS and SNTP implementation
• Telnet optimizations
• further reduced RAM consumption
• enhanced Influx transmission
• new LWIP based OTA transmission
• added direct action triggering support in MQTT
• several minor improvements and bugfixes
• added IPv6 support (disabled on 1MB devices per default)
• added support for multiple DNS servers
• porting work for ESP32-IDF V4.x (incomplete)
• updated setenv.sh to work with IDF tools concept
• ROMFS32 fixes
• enhanced module concept for debug messages
• added command for triggering events from shell
• HT16K33 should register as I2C device