Issue 4504 whiteout-style

[Paul Morris]

Greetings LilyPond devs,

I’m attaching patches for review for issue 4504 – implementing the 
whiteout-style approach instead of separate whiteout and whiteout-box commands. 
 

I tried to upload to Rietveld using Phil's new git-cl (from Federico's new 
LilyDev4) but so far no luck.  So I thought I’d go ahead and email it, if only 
for my own sense of having reached some milestone.  I’ll send a separate 
message about the git-cl error.

-Paul


Includes commits:

    Issue 4504/6 update changes.tely

    Issue 4504/5 edits to docs

    Issue 4504/4 edits to tests

    Issue 4504/3 run scripts/auxiliar/update-with-convert-ly.sh

    Issue 4504/2 convert-ly rule: whiteout-box --> whiteout

    Issue 4504/1 whiteout-box --> whiteout-style
    
    Introduce whiteout-style, with options of
    'box and 'outline, as a grob property to be
    used with the whiteout grob property, and as
    an optional property of the whiteout markup
    command.
    
    Remove the whiteout-box grob property and
    markup command, and use whiteout-style
    instead.
    
    Make the box style of whiteout the default
    style again, as it was before issue 4418.

0001-Issue-4504-1-whiteout-box-whiteout-style.patch
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0002-Issue-4504-2-convert-ly-rule-whiteout-box-whiteout.patch
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0003-Issue-4504-3-run-scripts-auxiliar-update-with-conver.patch
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0004-Issue-4504-4-edits-to-tests.patch
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0005-Issue-4504-5-edits-to-docs.patch
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0006-Issue-4504-6-update-changes.tely.patch
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