Curve renderer: drop the control point magic for line elements

Now that we are adding ever more manipulations of quadpaths, relying
on this silent state to not having been lost on the way is
bugprone. Also, being instead able to rely on the control point of a
line always being the line's midpoint, so that the element is a valid
representation even if treated as quad curve, makes for more resilient
code: it can make it optional whether to treat lines specially.

So replace the magic value by a new Element method referencePoint(),
that returns the control point for curves and the inside point for
lines, and use that in the one place that used to rely on the special
line control point.

Change-Id: Id54b9034d23d7bc7794f2f77fab36fbfe137a60e
Reviewed-by: Paul Olav Tvete <[email protected]>

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