[dev-context] Add toggle method to indent

[Aditya Mahajan]

Hi Hans,

Can you add a `toggle` key to `\setupindenting`. This will 
allow one to easily write poety where alternative stanzas are to 
be indented.

defineindentingmethod [toggle] {\ifdim\parindent=\zeropoint\relax
                                    \parindent\ctxparindent\relax
                                  \else
                                    \parindent\zeropoint\relax
                                  \fi}

\setuplines
 [inbetween={\blank[preference,line]\setupindenting[toggle]},
  indenting=no]

\startlines
....
\stoplines

Thanks,
Aditya
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