- added simple shell with few commands
- using DMA for UART
- separated ip_addr_config.h and changed default address to 192.168.0.52
- added ADC as audio source
- changed UART baudrate to 921600
- added audio loopback function (audio input) to audio_dac module
- switched to EmBitz 2.62
- using STM32 RNG and lfsr113 for rand()
- added WebRTC AEC (unfortunately there might be not enough RAM to use it)