SVG for system and general icons

Following previous one, I changed the settings / system icons to correspond with the action icon.

![svgicons](https://f.cloud.github.com/assets/127259/743254/2b47eda2-e3e4-11e2-9baa-7f7c8428998e.png)

The system is a newly created icon (it used to be the same as for actions)

Hope you still like them!

I also created a svgbase folder in the default theme in which you find the base icons (hammer, pointer, screwdriver, etc.)