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* SD.open() new feature for creating all folders in path

This PR adds to the SD.open() function option to create all folders to the file.

SD.open(const char* path, const char* mode, const bool create)

Default value of create is false.
When true folders are created.

From issue #5019

* Update vfs_api.cpp

memccpy -> memcpy

* SD_MMC deinit fix

Wrong deinit function was called.

We don't have submodules.

* Fix build compilation due to changes in the HW_TIMER's structs

* Fix compilation warnings and errors with USB

* Update USBCDC.cpp

* Update CMakeLists.txt

* Update HWCDC.cpp

* Implement Thread-Safe I2C based on ESP-IDF API

* Update esp32-hal.h

* use proper types for size and timeout

* Allow disabling of the HAL locks

* Limit frequency settings to prevent Interrupt WDT

* SD.open() new feature for creating all folders in path

This PR adds to the SD.open() function option to create all folders to the file.

SD.open(const char* path, const char* mode, const bool create)

Default value of create is false.
When true folders are created.

From issue #5019

* Update vfs_api.cpp

memccpy -> memcpy

* File f = open() edit

added false for create

* SDMMC frequency selection based on board type

On Olimex ESP32 EVB I/O operations with SD card can cause error when LAN is used in same time.
Problem is disappearing if SD MMC frequency lower down from SDMMC_FREQ_HIGHSPEED to SDMMC_FREQ_DEFAULT.

No problem if WiFi used instead LAN.

* Code rewritten according to https://github.com/espressif/arduino-esp32/pull/5688#pullrequestreview-759359645

Return size_t instead of uint8_t from BLECharacteristic::getLength().  Allows large MTU to be used. (#5687)

Fix compilation in case NO_GLOBAL_INSTANCES || NO_GLOBAL_SERIAL is defined.

* Add an error check for empty path of an URL

* Append '/' to an URL with empty path instead of returning an error

Fixes boards.txt entries for the atmegazero_esp32s2, and also the platform.txt  --flash_size which is not letting the board compile due to its 32MB size. (#5673)

only use ksz8081 for idf versions later than 4.3 (this fixes compile as component for idf 4.3) (#5599)

esp_eth_phy_new_ksz8081 was added in IDF after version 4.3 and generates a compilation error with IDF-4.3. This change will only use esp_eth_phy_new_ksz8081 for IDF versions after 4.3

Docs integration with Wokwi - Blink Tutorial

* Create PULL_REQUEST_TEMPLATE.md

Adding first version of PULL_REQUEST_TEMPLATE.md.

The purpose of this template is to improve and simplify writing more accurate Release Notes.

* Update PULL_REQUEST_TEMPLATE.md

Fix typo.

* Update README.MD - "Type: For reference" labels link

Updating a link to issues labeled with "Type: For reference". The old one is not working due to the updates of labels in the past.

This pull request contains a few fixes and improvements to the HWCDC implementation.
- Rework `HWCDC::write()` to accept unlimited data
- Add Semaphore to guard the TX Ring Buffer
- Add events support
- Remove unnecessary 1200bps touch for flashing over HWCDC
- Fix `HardwareSerial::setDebugOutput()` not resetting `putc` if the port is already selected, causing debug output to also show on HWCDC even when not selected.

Depending on `tud_cdc_tx_complete_cb` can cause in some cases the last packet to not be transmitted until more data is written and flushed. It's a rare case, but if the other end is expecting those last bytes, transmission will hang.

This PR also fixes debug output on CDC

* Add dummy test for self hosted GitHub runners

Supported devices table updated due the 2.0.0 release

Fixes: https://github.com/espressif/arduino-esp32/issues/5573

To reproduce:
1. Run any sample code that starts a BLE server, and does not call `setCallbacks`.
2. Connect to the device using the "LightBlue" app on iOS.
3. Observe crash shown in the issue linked above.

## Summary
Applies the upstream changes here: https://github.com/arduino/ArduinoCore-API/compare/3b88acac8%5E...0d83f1afc3367037dbde5323c2abd0ae1bd2c583

## Impact
Adds new String convenience methods that are now available in the mainline Arduino implementation, simplifying interoperability with C code that uses pointer+length strings rather than 0-termination. Also includes a change to avoid mutating the source string when taking a substring.

* Add support for the hardware CDC in ESP32-C3

* Adds rxBufferSize parameter to begin()

* Adds HardwareSerial::setRXBufferSize()