Partial port drawing operations to cairo

The activity starts but the canvas draw is wrong.
The old code used bitmap masks to define non rectangular areas,
like in the drum instruments or the loops.
Part of this is implemented with cairo, but is not finished.
As a final note, this is a too big patch, more work is needed,
and probably part of the code can be refactored.

Signed-off-by: Gonzalo Odiard <gonzalo@laptop.org>

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