Issue 1434: Fix text spacing in SVG

Issue 1434: Fix text spacing in SVG

This change makes every SVG contain a style tag with the `white-space`
property set to include all white-space (`pre`). This will cause all
white-space to be applied, and not be ignored.

As SVG files with `-dsvg-woff` set already appended a style tag, the
woff-header now only appends their settings, with a new define to close
the style tag.

The main difficulty arising with this change was with the newline
character that appears after each opening tag. To rectify, a boolean
parameter was added to define(s) on whether to insert a newline for
opening tags, and the appropriate value was passed to all uses of the
define(s).

[Ebe123, 2017-08-18 03:54:19]

This patch provides a more thorough solution to the spacing problem than my
other patch, specifically for metronome marks:
https://codereview.appspot.com/323420043/ .