Update IDF to de750e9 and add BLE (#723)

* Update IDF to de750e9

* Add BLE Library submodule

docs/arduino-ide/debian_ubuntu.md

@@ -13,7 +13,9 @@ Installation instructions for Debian / Ubuntu OS
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE

docs/arduino-ide/fedora.md

@@ -10,7 +10,9 @@ Installation instructions for Fedora
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE

docs/arduino-ide/mac.md

@@ -8,7 +8,9 @@ Installation instructions for Mac OS
   mkdir -p ~/Documents/Arduino/hardware/espressif && \
   cd ~/Documents/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - If you get the error below. Install the command line dev tools with xcode-select --install and try the command above again:

docs/arduino-ide/opensuse.md

@@ -14,7 +14,9 @@ Installation instructions for openSUSE
   mkdir -p ~/Arduino/hardware/espressif && \
   cd ~/Arduino/hardware/espressif && \
   git clone https://github.com/espressif/arduino-esp32.git esp32 && \
-  cd esp32/tools/ && \
+  cd esp32 && \
+  git submodule update --init --recursive && \
+  cd tools && \
   python get.py
   ```
 - Restart Arduino IDE