fixes #5239

* Add back clock mode argument

original PR #5278 from @s-hadinger, which is not accepted because of failure of CLAassistant

`ESP.getFlashChipSize()` always returns `0` on Esp32c3 due to a change in the Flash layout. It looks like to Espressif documentation was not updated accordingly.

https://docs.espressif.com/projects/esp-idf/en/latest/esp32c3/api-reference/storage/spi_flash.html#spi-flash-size

- Esp32 and Esp32s3 have the flash information update by esptool.py
and decribed here
- https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/storage/spi_flash.html
Esp32c3 has no image information at 0x0000 and contrary to the docu
this information is at offset 0x0000

When iterating through APlist from first to the last element, a corrected password for already known SSID is not used. Therefore, I propose to iterate from the back of the list. With iterating from the back through the vector, an already known SSID with a corrected password is used instead.

Additional compile arguments can be given by a file named "build_opt.h".
This enables users to easily extend their arguments on a central place.
The script has been taken from stm32duino's Arduino_Core_STM32 package
Co-authored-by: NMe No Dev <me-no-dev@users.noreply.github.com>

fixes #5115

fixes #4805

Fixes #4866

Add support for the Trueverit Universal IoT Driver MK II (https://www.trueverit.com)

The board will be released on market using electronic distributors soon, as the other one board added via #5219

This new board (referred as MK II) has onboard Texas Instruments DP83848 Eth PHY chip.

Typos fixed and added more details and instructions
Added README file to WiFiScan example
Review on the README template
Added link to DevKits

esp-dsp: master 7cc5073
esp-face: master 420fc7e
esp-rainmaker: f1b82c7
esp32-camera: master 7a06a7e
esp_littlefs: master b58f00c

The doitESPduino32/pins_Arduino.h lacks definitions for the common SPI pins names: SS, MOSI, MISO, SCK
This breaks compatibility with Arduino libs, including SPI.h/.cpp

This PR solves the issue while maintaining compatibility with previous pin naming (IO5/23/19/18), and ensures consistency with other boards variants.

New board addition request for an ESP32 Wrover based Developer Board

The code in the BLE library originates from https://github.com/nkolban/esp32-snippets/tree/master/cpp_utils as well as https://github.com/nkolban/ESP32_BLE_Arduino

The original code in the esp32-snippets library is apache-2.0 licence'ed.
In addition when Neil Kolban stopped maintaining this library he made it available with the express requirement that the licence stays as apache-2.0
(Please see: https://github.com/nkolban/esp32-snippets/issues/813)
"... I do require that it continue to be Apache Licensed and free of charge for any and all uses (private or commercial)."

This change is to clarify the licence of this library.

Proposed fix to #4627 as a remediation to PR #3995
#3995 introduced that a device detected on BLE would not be entered in vector if a callback has been defined. 
By doing so, it was not possible anymore to have a counter in a call back (AND device in vector) to limit the number of detected device in a single scan, which could crash ESP32 as a result.

WMath.cpp doesn't include Arduino.h, where makeWord(h, l) is declared, common denominator type therefore is uint8_t, which is in use already in Arduino.h, too. (#5230)

Fixes #5229

* add onMtuChanged to BLEServerCallbacks

Add method onMtuChanged to the BLEServerCallbacks so the application can be notified if the MTU size changes.

* Correct missing semicolon and misspelled method.

Correct missing semicolon and misspelled method.

Thi may happen if read() gets called repeatedly (such as in HttpClient to parse response headers) and the connection is closed unexpectedly or the remote peer may have unexpected behavior that causes the underlying socket to report an error. In that case read() itself calls stop(), which invalidates the receive buffer object. Then when read() is called again without checking, such as inside readStringUntil(), the _rxBuffer is null and ESP32 crashes.

* Add uPesy ESP32 DevKit boards support

Add support for the Trueverit Universal IoT Driver (https://www.trueverit.com)

The board will be released on market using electronic distributors soon

esp-dsp: master 7cc5073
esp-face: master 420fc7e
esp-rainmaker: f1b82c7
esp32-camera: master 6f8489e
esp_littlefs: master b58f00c

* Bump library versions to 2.0.0

* Fixed name on SD library (see #5181)

This PR lets the user override the LOOP STACK SIZE set in sdkconfig (for example with -DARDUINO_LOOP_STACK_SIZE=12288).

Pull request #4999 added setMTU function to BLEClient.cpp/.h, this line provides implementation of this added functionality to the BLE client example to resolve cases in which data from notifyCallback exceeds 20 characters (3 bytes for command type and attribute ID, 20 bytes for attribute data (char*)pData).

* Add files via upload

Adding of Contributing.rst file.

* Update CONTRIBUTING.rst

* Added condition to only use tinyusb as needed

* Removed esp32c3 from targets supporting tinyusb

* AP with old WPA should not be used due security flaws.
* restore behavior from 1.0.6, see https://github.com/espressif/arduino-esp32/blob/46d5afb17fb91965632dc5fef237117e1fe947fc/libraries/WiFi/src/WiFiAP.cpp#L127

Board images updated and added warning on Flash/PSRAM pins

add board KB32-FT