ButtonGroup childrens parsing about sanderling

[Viir]

This issue of buttons not being present in memory readings looks familiar.
Earlier this year, we encountered a similar issue when looking at message boxes and the repair shop window.

You can see the discussions in these GitHub issues:

• Viir/bots#71
• Viir/bots#62

Since we did not find a representation in memory, we solved the reading using image processing. Now most bots read the pixels to classify the button labels. At the moment, they classify the whole label, not individual characters. With this approach, we add training data for each new button label you want to use.

You can see some examples of training data here: https://github.com/Viir/bots/blob/ea2d4213ab59776fb32fc1f80592bff1d3fa8a53/implement/applications/eve-online/eve-online-framework-test/tests/ParseGuiFromScreenshotTest.elm