Make arguments like Context.GrobName accessible as symbol lists

Documentation/snippets/pitches-headword.ly

 %% DO NOT EDIT this file manually; it is automatically
 %% generated from LSR http://lsr.dsi.unimi.it
 %% Make any changes in LSR itself, or in Documentation/snippets/new/ ,
 %% and then run scripts/auxiliar/makelsr.py
 %%
 %% This file is in the public domain.
-\version "2.16.0"
+\version "2.17.6"
 
 \header {
   lsrtags = "headword"
 
   texidoc = "
 Piches headword
 
 "
   doctitle = "Pitches headword"
 } % begin verbatim
@@ skipping 42 matching lines @@
       ds'4
       |
       \clef treble
       <e' gs>4 %)
       r4 r2
     }
 
     % RH Voice 2
     \new Voice {
       \voiceTwo
-      \override Staff.DynamicLineSpanner #'staff-padding = #2.5
+      \override Staff.DynamicLineSpanner.staff-padding = #2.5
       <e'' b'>2 \p
       <ds'' a'>4
       <cs'' gs'>4
       |
       <bs' fs'>2
       e'2
       |
-      \once \override TextScript #'staff-padding = #2.5
+      \once \override TextScript.staff-padding = #2.5
       <b'! a'>2 _ \markup \italic { cresc. }
       b'4
       <e'' cs''>4
       |
       b'2. ( \sf \>
       a'4 )
       \clef bass
       | \break
       s1 \p
       |
       s1
       |
       <gs e>4 (
       <a fs>2. )
       |
       s4
       r4 r2
     }
 
   >>
 
   % LH Staff
   \new Staff {
-    \override Staff.SustainPedalLineSpanner #'staff-padding = #5
+    \override Staff.SustainPedalLineSpanner.staff-padding = #5
     <gs' e'>2 ( \sustainOn
     <fs' ds' b>4 \sustainOff
     <e' cs'>4
     |
     <ds' bs gs>2
     <cs' a>2 ) \sustainOn
     |
     \clef bass
     \slurDown
     <ds' b! a fs>2 ( \sustainOff
@@ skipping 23 matching lines @@
     <ds bs, gs,>2
     <cs a,>2 ) \sustainOn
     |
     <b,! b,,!>1 ( \sustainOff
     |
     <e e,>4 )
     r4 r2
   }
 
 >>