Add sample viewer for languages

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Add some sort of sample viewer for languages to allow users to view/edit/compile them to help with learning.

It may be best to have them copied to another location outside the extension so they can be kept.

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Finally we now include a Learning Center (from v0.11.3) to help new users!! Still to add bB samples but we have a starting point.

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As part of 0.11.9 batari Basic examples have now been added. Soon some PXE examples will also be added to start filling out the bB library.