Improved SVG Export

[erinehall]

Look into alternative ways to generate an SVG of navigator's matrix. Looking for the following improvements:

• Easy/quick rendering & generally improved code around rendering
• Improved look/feel of the SVG, a cleaner design and more cohesive look. Fix legend.
• User customizable - all of the current custom options, plus the ability to modify the font size
• Ability to easily copy/paste SVG into documents such as MS Word or PPT

[jondricek]

One more thing to add to this ticket is that the legend on exported SVGs looks pretty horrible sometimes too, e.g. this Navigator Layer view of APT29