Non-quadratic form of whiteout

[Lukas-Fabian Moser]

Dear developers,

following a feature request on -user I tried my hand at implementing a 
feature enabling non-quadratic form for box-whiteouts.

As I never participated in developing before (and only rarely get down 
to coding these days), I'm pretty sure that what I did is substandard. 
Urs Liska was kind enough to point me to the LilyPond repository on 
GitHub (and comment on some aspects of my changes), but I unterstand 
that is not really the right place.

So I just post a patch here in case anyone would be interested in 
helping me bring my small contribution up to scratch.

Basically it adds to the 'whiteout property - which, at the moment, can 
either be a boolean or a number indicating the dimension of a quadratic 
whiteout box - a third possibility, namely a number pair giving x- and 
y-dimension separately. For instance:

\version "2.21"

\new Staff {
  \override NoteHead.whiteout = #'(5 . 40)   % Pair of X-thickness and 
Y-thickness
  g'4
  r2
  \override NoteHead.whiteout = #'(40 . 5)
  g'4
}

Best
Lukas

0001-Non-quadratic-whiteouts.patch
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