Enable engine in board editor for composing puzzles

[drdoom]

It would be nice if we can enable the engine analysis in Board Editor, this will allow easily compose puzzles by placing a piece here and there and knowing instantly the engine evaluation. Also may be in endgames I could ask what happens if this pawn is in rank 4 or 6 or 7. It will be very interesting for teaching and not so hard to code.

[ornicar]

I'm glad that you find it's "not so hard to code". I'll be awaiting your contribution.