Initial SAV MkI (RepRap CloneWars board) integration.

Included support for BT dongle on AT90USB boards.
Added LCD Shift Register LCD control
Included support for RepRap Clone Wars project board (SAV MKI).

Marlin/MarlinSerial.cpp

@@ -320,3 +320,9 @@ MarlinSerial MSerial;
 
 #endif // whole file
 #endif // !AT90USB
+
+// For AT90USB targets use the UART for BT interfacing
+#if defined(AT90USB) && defined (BTENABLED)
+   HardwareSerial bt;
+#endif
+