AutoCompletionListener

[acardona]

So that e.g. Fiji update sites can add more completions

in response to entered text.

Notice that entered text is the entire line up to the text caret.

Please try it out @haesleinhuepf. Should be obvious how to use it.

[imagesc-bot]

This pull request has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/auto-code-completion-for-python-and-groovy-in-imagej-fiji/20515/21