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

lib/usbhost/arduino-1.0.1/cores/arduino/Client.h

@@ -0,0 +1,26 @@
+#ifndef client_h
+#define client_h
+#include "Print.h"
+#include "Stream.h"
+#include "IPAddress.h"
+
+class Client : public Stream {
+
+public:
+  virtual int connect(IPAddress ip, uint16_t port) =0;
+  virtual int connect(const char *host, uint16_t port) =0;
+  virtual size_t write(uint8_t) =0;
+  virtual size_t write(const uint8_t *buf, size_t size) =0;
+  virtual int available() = 0;
+  virtual int read() = 0;
+  virtual int read(uint8_t *buf, size_t size) = 0;
+  virtual int peek() = 0;
+  virtual void flush() = 0;
+  virtual void stop() = 0;
+  virtual uint8_t connected() = 0;
+  virtual operator bool() = 0;
+protected:
+  uint8_t* rawIPAddress(IPAddress& addr) { return addr.raw_address(); };
+};
+
+#endif