Dotted and dashed support added

It was a long time since we wanted to have dotted and dashed support for figures, connectors and containers.

We finally have it. Check the screenshot bellow.

As new browsers have support for dashed lines we tried to use it where available. Older browsers that do  not have dashed line support will not be able to use this unless we add a "fallback" method to simulate dashed lines.

The problem with simulation is that it can easily increase the computation time thus making the entire browser / engine to become sluggish.

Enjoy the dotted line support.