Copy code fragment to clipboard

[BramDevlaminck]

For a lot of exercises it is useful to copy code-fragments from the assignment to use them for testing.
This is especially handy in python where the given examples can easily be used in doctests.

However, some of these examples are very long on 1 line (see this example).

In this case it could be very handy to have a button in the top right of this code-block to just copy the whole codeblock to the clipboard.

This would be very similar to the implementation of code fragments in the documentation of some frameworks.
Small example from the prisma-documentation: