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

lib/usbhost/USB_Host_Shield_2.0/examples/max_LCD/max_LCD.ino

@@ -0,0 +1,29 @@
+// Just a copy of the HelloWorld example bundled with the LiquidCrystal library in the Arduino IDE
+
+// HD44780 compatible LCD display via MAX3421E GPOUT support header
+// pinout: D[4-7] -> GPOUT[4-7], RS-> GPOUT[2], E ->GPOUT[3]
+
+#include <max_LCD.h>
+
+// Satisfy IDE, which only needs to see the include statment in the ino.
+#ifdef dobogusinclude
+#include <spi4teensy3.h>
+#include <SPI.h>
+#endif
+
+USB Usb;
+Max_LCD lcd(&Usb);
+
+void setup() {
+  // Set up the LCD's number of columns and rows:
+  lcd.begin(16, 2);
+  // Print a message to the LCD.
+  lcd.print("Hello, World!");
+}
+
+void loop() {
+  // Set the cursor to column 0, line 1 (note: line 1 is the second row, since counting begins with 0):
+  lcd.setCursor(0, 1);
+  // Print the number of seconds since reset:
+  lcd.print(millis() / 1000);
+}