ng options / blueprints: factor them out

[catull]

It would be great if availableOptions and blueprints are extracted from the commands.
These constants are then imported in the resp. commands, but are also available for different purposes.

[catull]

Accidentally clicked on the "Close and comment" button instead of just moving the mouse away.

[catull]

Implemented in #4390.

[filipesilva]

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