* Update IDF to 9274814

* Fix error in i2c and Arduino

Correct 10bit Device address handling.

Add initial handling for long I2C reads.

The existing code did not follow protocol with 10bit addressed devices.  Per _Philps/NXP Semiconductors UM10204 I2C-bus specification and user manual Rev. 6 4April2014_ pg.15 3.1.11 10-bit addressing:
~The first seven bits of the first byte are the combination of 1111 0xx of which the last two bits (xx) are the two Most-Significant Bits (MSB) of the 10-bit address; the eighth bit of the first byte is the R/!W! bit the determines the direction of the message~

Missed definition

Fixes: https://github.com/espressif/arduino-esp32/issues/749

Works even when single core mode is selected

The i2cWrite() function was returning to the app before the i2c transaction had completed.  This caused the next Wire() call to return a I2C_ERROR_BUSY.

Usable for library developers who write code not dependent on Arduino.
Adding 3 lines to the includes will permit their debug messages to be
visible in Arduino IDE or when enabled under IDF

* Update IDF to de750e9

* Add BLE Library submodule

Added argument to HardwareSerial.begin to specify whether the logic levels of the UART rx and tx lines should be inverted (#719)

* ESP32 default port in comment

* ESP32 default hostname.

Fixes: https://github.com/espressif/arduino-esp32/issues/710

* Create ledcWrite_demo_ESP32_RGB.ino

adding the public domain example ledcWrite_demo_ESP32.ino to this repo.  Added RGB to the name for people searching, added some comments, and renames things to make a bit more sense.

* Update ledcWrite_demo_ESP32_RGB.ino

renamed to ledcWrite_RGB.ino and added a couple more comments based on https://github.com/espressif/arduino-esp32/issues/689

* Rename libraries/ESP32/examples/AnalogOut/ledcWrite_demo_ESP32_RGB/ledcWrite_demo_ESP32_RGB.ino to libraries/ESP32/examples/AnalogOut/ledcWrite_RGB/ledcWrite_RGB.ino

Renamed.

Fixes: https://github.com/espressif/arduino-esp32/issues/708

Fix redefines of strXXX, original was using strnXXX with length set to 0x7fffffff.  This caused problems with strcpy and strcat. The destination buffer was NULL'd to 0x7fffffff which killed the app.

* Chip revision fix

https://www.esp32.com/viewtopic.php?f=2&t=1358&sid=f77cd62ec254317f3bbb30d8ab75ca2a&start=10

* using of esp_chip_info instead of register reading

Fixes #694

* Print error when serial number is invalid

* Move to the first check, change end by return

Use UTC instead of CDT for consistency

This reverts commit c2406749.

* Addition of a i2cReset method and timeout handling for the case where the i2c hardware FSM (state machine) gets stuck in a busy state.

* Use newly added i2cReset function within the wire library.

* Add example to update ESP32 via SD card

* Delete update.bin from sd upon finishing update

* remove precompiled binary from example

* Check whether update.bin is a file