Rename fletch -> dartino

pkg/dartino_compiler/lib/src/verbs/README.md

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-# Design for Fletch Command Line Interface commands
+# Design for Dartino Command Line Interface commands
 
-The overall structure of commands in Fletch should follow:
+The overall structure of commands in Dartino should follow:
 
 ```
-fletch verb [zero or more verbs or object-nouns]
+dartino verb [zero or more verbs or object-nouns]
 ```
 
 The outermost verb is the group of actions to be performed 
 (for example, 'help'). Subsequent verbs are either 'sub-verbs'
 (for example, 'debug step') or are the target of the outer verbs 
 (for example 'help debug').
 
-Object-nouns are the target of the command (for example, 'fletch show changes')
+Object-nouns are the target of the command (for example, 'dartino show changes')
 
 The overall aim here is to provide the ability to 'vocalise' the instructions,
 in other words to say them to yourself as you type them.
 
 ## Some examples
 
 ```
-fletch debug step
+dartino debug step
 ```
 
 should perform the next step of execution. 
 
 ```
-fletch help
+dartino help
 ```
 
 should provide 'top level' help, whereas:
 
 ```
-fletch help debug
+dartino help debug
 ```
 should provide help about debug.
 
 
 ## Exceptions
 
 Help should be supported everywhere as a top level verb and a sub-verb,
 in other words:
 
 ```
-fletch help debug
+dartino help debug
 ```
        and
 ```
-fletch debug help
+dartino debug help
 ```
 
 Should display the same text.