Mongoose OS 2.3

• A lot of work on STM32 (but not ready yet)
• mos: Reduce default ESP flashing baud rate. This will make flashing slower by default but hopefully more reliable. use --esp-baud-rate to set higher.
• mos: Fix path mapping in debug-core-dump
• Add a knob for enabling autocommit on ota-update (shadow.autocommit)
• Update the C UART example to show how to process input line by line.
• Introduce "params" as alias for "args" in RPC to make our RPC
• Move docs to cesanta/mongoose-os-docs
• WiFi: Reduce rate of reconnects when not connected
• vfs-dev-spi-flash: SFDP 1.6 and DPD support
• Add Bearer auth for WS RPC channel
• Move Docker images to docker.io/mgos
• wifi: Fix crash in ent auth when user is not set
• Add MGOS_TIMER_RUN_NOW flag
• Add FS.Rename
• mos: Support globs in init_deps entries
• rpc: Fix memory leak in RPC auth over HTTP
• RPC UART: One frame per line
• rpc-uart: Add a simple tool to make RPC requests
• Add OTA.{Begin,Write,End}