Rename fletch -> dartino

tests/debugger/uncaught_exceptions_expected.txt

 Starting session. Type 'help' for a list of commands.
 
 > r
 Uncaught exception: 42
 * 0: foo         @throw 42
   1: main        @foo()
 > restart
 Uncaught exception: 'foobar'
 * 0: foo         @throw 'foobar'
   1: main        @foo()
 > restart
 Uncaught exception: Instance of '_Exception' {
   _Exception.message: 'foobar'
 }
 * 0: foo         @throw new Exception('foobar')
   1: main        @foo()
 > restart
 Uncaught exception: Instance of 'CustomException' {
   CustomException.message: 'foobar'
   CustomException.code: 42
 }
 * 0: foo         @throw new CustomException('foobar', 42)
   1: main        @foo()
 > restart
 foo
 Uncaught exception: NoSuchMethodError: Class 'MyObject' has no method named 'bar' that takes 0 arguments
 * 0: foo                             @object.bar()
   1: main                            @foo()
-> Non-zero exit code from 'fletch-vm' (255).
+> Non-zero exit code from 'dartino-vm' (255).