* fixes setPins and begin to keep rx/tx unmodified
* adds Hardware Flow Control mode and CTS/RTS pin setting
* adds Hardware Flow Control mode and CTS/RTS pin setting
* adds Hardware Flow Control mode and CTS/RTS pin setting
* adds Hardware Flow Control mode and CTS/RTS pin setting
* Code Review
## Summary
This PR is a complete reffactoring of UART Serial Hardware and respective HAL in order to use IDF instead of current Register manipulation approach.
It implements Arduino SerialEvent functionality.
Fix#5287Fix#5273Fix#5519Fix#5247Fix#5403Fix#5429Fix#5047Fix#5463Fix#5362Fix#5112Fix#5443
## Impact
It solves many reported issues related to UART.
It was tested and works fine for ESP32, ESP-S2 and ESP32-C3.
* Add initial support for USB MSC
* Add Firmware Upload/Download With MSC
Current running firmware is available as file inside the MSC Disk. To update the firmware on the ESP, just copy a regular firmware bin into the drive
* Support overwriting of the firmware file
Overwriting a file is done totally differently on MacOS, Windows and Linux. This change supports it on all of them.
* Allow CDC, FirmwareMSC and DFU to be enabled on boot
* Add example ESP32-S2 USB-ONLY board
* Various device code optimizations
Added `end()` methods to MSC classes
Made begin() methods safe to be called multiple times
Optimized CDC class
* Fix CDC Connect/Disconnect detection in Arduino IDE on Windows
* Rework cdc_write
* Update ESP32-S2 board configs
* API compatibility to AVR, ESP8266, et al
* Add non-blocking HardwareSerial::read(buffer, size) extension (ESP8266 portability)
* Refactor for fewer indirect calls.
* add option to Flush() to only clear txQueue
Add the option to cause Flush() to just wait for tx data to clear the tx fifo and uart, leave the rx queue and rx fifo as is.
* support tx only flush()
* support tx only Flush()
* support txOnly for Flush()
* compatibility to Stream()
* compatibility for Stream()
* default value error
* default value error
* Update esp32-hal-uart.h
* Update esp32-hal-uart.c
* Update HardwareSerial.cpp
* sp
* correctly implement flushTxOnly()
* Added baudrate detection to esp32-hal-uart and HardwareSerial
* Solved compiler warning for uartResizeRxBuffer()
* Add unit to header variable name (timeout_ms)
* Reverting accidentally changed files to master
* Add small delay after baudrate detection
