Allow multiple line syntax for %slice%

It would be really great if %slice% could be written out across multiple lines. This would really make managing larger stacks much easier.

Example:

%slice -addTypes="
ws.foundation.fontstyle,
-,
ws.foundation.fontfamily,
ws.foundation.googlefont,
-,
com.joeworkman.stacks.fontpro.google,
com.joeworkman.stacks.fontpro.handco,
com.joeworkman.stacks.fontpro.indivne,
com.joeworkman.stacks.fontpro.installed,
com.joeworkman.stacks.fontpro.system,
com.joeworkman.stacks.fontpro.typekit,
com.joeworkman.stacks.fontpro.webfont,
-,
com.joeworkman.stacks.fontpro.styles.child" -addInit=0%