Configurable SVG Attributes
Adds attribute support to the render directive, supporting: title, class, width, height
e.g.
```noml render width=100 height=50 class=css-name title="my title"
[Foo]->[Bar]
```
Adds attribute support to the render directive, supporting: title, class, width, height
e.g.
```noml render width=100 height=50 class=css-name title="my title"
[Foo]->[Bar]
```