The svg macro has different height/width scaling behavior than the standard image macro

[eric-schneider]

The standard image macro processes width and height attributes according to specific scaling rules. The svg macro doesn't appear to follow these same rules.

Test syntax:

== `image:`

image:ROOT:logo.svg[width="100"]

image:ROOT:logo.svg[height="100"]

image:ROOT:logo.svg[width="100",height="100"]

== `svg:`

svg:ROOT:logo.svg[width="100"]

svg:ROOT:logo.svg[height="100"]

svg:ROOT:logo.svg[width="100",height="100"]

== `image::`

image::ROOT:logo.svg[width="100",align="left"]

image::ROOT:logo.svg[height="100",align="left"]

image::ROOT:logo.svg[width="100",height="100",align="left"]

== `svg::`

svg::ROOT:logo.svg[width="100",align="left"]

svg::ROOT:logo.svg[height="100",align="left"]

svg::ROOT:logo.svg[width="100",height="100",align="left"]