extractor = ExtractVariable(myproject, resource, start, end)
Where `start` and `end` are the offsets of the region to extract in
+resource. Be careful when calculating the offsets. Dos line-endings
+and multi-byte characters are considered to be only one character.
+This is actually easier for IDEs, since most GUI libraries do that
+when calculating offsets.
Next we need to perform the refactoring. IDE's usually pop up a
dialog for letting the user configure refactoring option like the name