Add Weapon/Sensor Range Fan

[gallenem]

As an experiment I have created two new javascript files to create both Weapon/Sensor Range Fan Circular and Weapon/Sensor Range Fan Sector with an appropriate weapon symbol at the anchor point.

Here are the results of my experiment:
Circular:

Sector:

I am totally new to Github, so please advise as to how I can propose adding the new files and the files that I have modified to expose the new functionality?

[ThomasHalwax]

@gallenem Looks good! We also tried to use milgraphics in our open source C2IS ODIN but switched to our own implementation. The reason for this was that we wanted a smooth user experience for editing complex military graphics.
If you are interested you are highly welcome to take a look and/or participate.
Best regards, Thomas