Add support for the v1.8.6 compiler.libraries.ldflags:

https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification

This fixes the issue reported here:

https://community.bosch-sensortec.com/t5/MEMS-sensors-forum/BSEC-1-4-7-4-compilation-error-on-ESP32-1-0-3-rc1/td-p/9120

When connecting using transportTraits, the CA and client certificates are ignored after the initial _client->connect() is called. This is because on connect, WiFiClientSecure will call start_ssl_client with _CA_Cert and other cert options set to null unless setCACert, setCertificate etc. are called before connect. Running _transportTraits->verify after connect therefore does exactly nothing. It's easy to verify that this is the case by passing a CACert to HTTPClient with verbose logging enabled - the logs will say "WARNING: Use certificates for a more secure communication!" which is only present when both PSK and CA are null. This change fixes the issue.

Real DNS resolving timeout used by lwip library is 14[s] (7[s] for DNS1 + 7[s] for DNS2). Function WiFiGenericClass::hostByName() has timeout set to lower value (only 4[s]), so callback function may be called after this low timeout and it may overlappe stack memory used now by other function.
Fixes #3722

* Extend Print class for 64bit integers.

modulo 32bit and 64bit tuned for code size.

* Fix 32bit long used in long long printNumber.

Greatly reduces error rate (half, or 0 zero errors, depends on in/out ranges) for round-trip mapping at the same performance. (#3655)

(Based on "improved_map" from ESP8266's Servo.cpp)

fix some mistake

This sketch provide functionality for OTA firmware upgrade.

Fixes: https://github.com/espressif/arduino-esp32/issues/3779

They are all broadly similar, all being based on the ESP32-D0WD core, but have
some subtle differences between variants around PSRAM inclusion and camera pin
mappings.

The ESP32CAM "unit" product (SKU: U007) has no PSRAM and maps the
"Pixel Data 0" (Y2 GPIO/OV2640 D2) camera pin to IO17 rather than IO32 as is
the case with most other M5Stack ESP32 camera devices.

The ESP32CAM also requires the "hmirror" and "vflip" camera configuration
bits setting in order to capture a true image.

The relevant M5Stack pin configuration documentation can be found here:
https://docs.m5stack.com/#/en/unit/esp32cam?id=pinmap

There is no need to decrement if nothing was removed from removePeerDevice

Reference issue:
#3974

* Add 'KITS Edu ESP32' board definition

add 'KITS Edu ESP32' board definition

* Modify board name

the board name was modified.

* Change the board name

Finally, we decided the board name.

- 'KITS ESP32 EDU'
Co-authored-by: NHamson Park <hamson.park@koreaits.com>
Co-authored-by: NHamson Park <hspark3235@gmail.com>

* change m5camera pins

* add M5Camera version B pins

* add M5Camera version B pins

According to ESP-IDF API
https://github.com/espressif/esp-idf/blob/dc14d027cec49260b78efb1c3724b1710f2f3ec0/docs/en/api-reference/peripherals/sdmmc_host.rst :

"To configure the bus width, set the width field of :cpp:class:`sdmmc_slot_config_t`. For example, to set 1-line mode:

sdmmc_slot_config_t slot = SDMMC_SLOT_CONFIG_DEFAULT();
slot.width = 1;
"

Co-authored-by: NPaul <Paul.Martinsen@NumberEightInnovation.com>

Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>

Co-authored-by: NIvan Kravets <me@ikravets.com>

* Add M5Stack-ATOM Board

* Add M5Stack-ATOM Board

* Add M5Stack-ATOM Board
Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>

1. WiFiProv.ino sketch is added that allows arduino users to do provisioning via SoftAP or BLE. WiFi.beginProvision( ) API is designed for provisioning in Arduino.
2. In WiFiProv.h provisioning class is defined.
3. WiFiProv.cpp contains implementation for provisioning class.
4. README.md file is added which contains detail information for working.

* add handbit

* add handbit pins_arduino

* Update boards.txt

The boundary delimiter (_STREAM_BOUNDARY) needs to be send before the
body part (_STREAM_PART) too follow RFC2046. This caused ffplay/ffmpeg
to fail to open the MJPEG stream.

* Add Senses's WEIZEN board from Senses IoT platform

* Add Senses's WEIZEN board (updated variant)

This reverts commit b2c67887.

* std::shared_ptr Memory Leak

clientSocketHande and _rxBuffer are std::shared_ptr, the stop() call was not correctly releasing them and the operator= had similar problems fix for #3679

* operator= second attempt

* operator= third time

* Minimize HardwareSerial Receive and Transmit delays

* Remove uartRxFifoToQueue from esp-hal-uart.h
Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>

* fix removeApbChangeCallback() error in spiStopBus()

spiStartBus() was using spiStopBus() to init the hardware, one of spiStopBus() functions is to unregister the runtime CPU clock speed change callback. But, spiStartBus() only wanted to init the hardware.  This patch separates the hardware init into a standalone function spiInitBus() that both spiStartBus() and spiStopBus() call.

* Update esp32-hal-spi.c

capitalization problem

WiFiClient.connected() was hanging thinking there was still a connection when the remote had already closed. The one-liner in this patch addresses recv() returning 0 and errno==128. I couldn't find the corresponding errno for 128 but its caught by the case statement which includes EPIPE, ENOTCONN, ECONNRESET and ECONNABORTED so I assume its one of those. Broken pipe maybe?
```c
[D][WiFiClient.cpp:511] connected(): Disconnected: RES: 0, ERR: 128
```
EDIT: added comment to reflect that recv() can set errno when it returns 0.

* Fix flush

flush should not flush the read buffer, it should wait till all output is drained from the write buffer.

* Update BluetoothSerial.cpp
Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>

* IDF release/v3.3 46b12a560

* fix build

* IDF release/v3.3 367c3c09c