* Update IDF to 65acd99

* Update platformio and arduino build paths and libs

* Update esptool binaries

Implements: https://github.com/esp8266/Arduino/pull/2883
Fixes: https://github.com/espressif/arduino-esp32/issues/313
Fixes: https://github.com/espressif/arduino-esp32/issues/344

Fixes: https://github.com/espressif/arduino-esp32/issues/329

Fixes: https://github.com/espressif/arduino-esp32/issues/343

* Add ESP.getChipId() function to get ESP32's ChipID.

* change getChipId() to getEfuseMac()

It appears that the configurations for `ck_out_edge` were inverted for `SPI_MODE2` and `SPI_MODE3`. You can check the technical reference manual on page 76, table 23 "Clock Polarity and Phase, and Corresponding SPI Register Values for SPI Master".

I've check with my oscilloscope that the current configuration is wrong and this fix corrects the issue.

fixing github url.

Remove missing column so github can beautify the contents

Fixes: https://github.com/espressif/arduino-esp32/issues/309

Fixes: https://github.com/espressif/arduino-esp32/issues/304

Thanks @jliegner :)

thans @martinayotte

* Support self signed certificates

Fix for https://github.com/espressif/arduino-esp32/issues/265

mbedtls_ssl_conf_authmode was defined before mbedtls_ssl_config_defaults causing several bugs when no CA certificate is defined.

* Implement Arduino's log facility

Replace printf by ESP log handling

* Remove \n from debug messages

log_ doesn't need \n to break line.

Should Fix: https://github.com/espressif/arduino-esp32/issues/234

Thanks @marcmerlin and @MartyMacGyver

Fixes: https://github.com/espressif/arduino-esp32/issues/275

Fixes: https://github.com/espressif/arduino-esp32/issues/263

Fixes: https://github.com/espressif/arduino-esp32/issues/270

Actually WiFiMulti is not working due some functions haven't equal comportment of ESP8266
Replace status == WL_DISCONNECTED => status != WL_CONNECTED
Replace scanComplete() => scanNetworks()

Maybe is more interesting, for keep the maximum compatibility, investigate why WL_DISCONNECTED and scanComplete() doesn't works in this case instead of just replace by this pull request.

Closes: https://github.com/espressif/arduino-esp32/pull/267

The card seems to need a bit of a nudge at boot to properly mount
sometimes.
Fixes: https://github.com/espressif/arduino-esp32/issues/272

Some boards have different default pins for SPI

Thanks @Ladyada

It's look more a practical guide "how to use SD lib"