Rename fletch -> dartino

tests/debugger/fibers_expected.txt

Index: tests/debugger/fibers_expected.txt
diff --git a/tests/debugger/fibers_expected.txt b/tests/debugger/fibers_expected.txt
index 8ee1df420acb982fabf197e318db61fcdfaed6b7..ee97f81636f01c084e51a887001d14848056b521 100644
--- a/tests/debugger/fibers_expected.txt
+++ b/tests/debugger/fibers_expected.txt
@@ -26,7 +26,7 @@ fiber 1
   1: run                         @print('${marker} ${i}')
   2: call                        @run('a')
   3: runToEnd                    @entry()
-  4: Fiber.call                  @fletch.runToEnd(entry)
+  4: Fiber.call                  @dartino.runToEnd(entry)
   5: Coroutine._coroutineStart   @entry(argument)
 > fibers
 
@@ -36,7 +36,7 @@ fiber 0
   2: run                         @Fiber.yield()
   3: call                        @run('b')
   4: runToEnd                    @entry()
-  5: Fiber.call                  @fletch.runToEnd(entry)
+  5: Fiber.call                  @dartino.runToEnd(entry)
   6: Coroutine._coroutineStart   @entry(argument)
 
 fiber 1
@@ -44,7 +44,7 @@ fiber 1
   1: run                         @print('${marker} ${i}')
   2: call                        @run('a')
   3: runToEnd                    @entry()
-  4: Fiber.call                  @fletch.runToEnd(entry)
+  4: Fiber.call                  @dartino.runToEnd(entry)
   5: Coroutine._coroutineStart   @entry(argument)
 
 > t internal