Rename fletch -> dartino

pkg/stm32f746g_disco/lib/uart.dart

 // Copyright (c) 2016, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 library stm32f746g.uart;
 
-import 'dart:fletch.ffi';
+import 'dart:dartino.ffi';
 import 'dart:typed_data';
 
 final _uart_write = ForeignLibrary.main.lookup('uart_write');
 final _uart_read = ForeignLibrary.main.lookup('uart_read');
 
 class Uart {
   ForeignMemory _getForeign(ByteBuffer buffer) {
     var b = buffer;
     return b.getForeign();
   }
@@ skipping 30 matching lines @@
     var mem = new ForeignMemory.fromStringAsUTF8(message);
     try {
       // Don't write the terminating \0.
       _uart_write.icall$2(mem, mem.length - 1);
     } finally {
       mem.free();
     }
   }
 }