Move USB Host Shield and Arduino core to lib/ (#13973)

lib/usbhost/USB_Host_Shield_2.0/examples/Bluetooth/SPP/SPP.ino

@@ -0,0 +1,52 @@
+/*
+ Example sketch for the RFCOMM/SPP Bluetooth library - developed by Kristian Lauszus
+ For more information visit my blog: http://blog.tkjelectronics.dk/ or
+ send me an e-mail:  kristianl@tkjelectronics.com
+ */
+
+#include <SPP.h>
+#include <usbhub.h>
+
+// Satisfy the IDE, which needs to see the include statment in the ino too.
+#ifdef dobogusinclude
+#include <spi4teensy3.h>
+#include <SPI.h>
+#endif
+
+USB Usb;
+//USBHub Hub1(&Usb); // Some dongles have a hub inside
+
+BTD Btd(&Usb); // You have to create the Bluetooth Dongle instance like so
+/* You can create the instance of the class in two ways */
+SPP SerialBT(&Btd); // This will set the name to the defaults: "Arduino" and the pin to "0000"
+//SPP SerialBT(&Btd, "Lauszus's Arduino", "1234"); // You can also set the name and pin like so
+
+bool firstMessage = true;
+
+void setup() {
+  Serial.begin(115200);
+#if !defined(__MIPSEL__)
+  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
+#endif
+  if (Usb.Init() == -1) {
+    Serial.print(F("\r\nOSC did not start"));
+    while (1); //halt
+  }
+  Serial.print(F("\r\nSPP Bluetooth Library Started"));
+}
+void loop() {
+  Usb.Task(); // The SPP data is actually not send until this is called, one could call SerialBT.send() directly as well
+
+  if (SerialBT.connected) {
+    if (firstMessage) {
+      firstMessage = false;
+      SerialBT.println(F("Hello from Arduino")); // Send welcome message
+    }
+    if (Serial.available())
+      SerialBT.write(Serial.read());
+    if (SerialBT.available())
+      Serial.write(SerialBT.read());
+  }
+  else
+    firstMessage = true;
+}