WIP: Determine visibility based on bounding box corners vs midpoint

[corydickson]

Addresses #15

• [x] Check los between antenna location and building corners
• [ ] Make sure loc is within beam width
• [ ] Use Fresnel zone intersection instead of straight line

Just wondering if the currently used coordinate for the antenna is all we need, it's donated as the midpoint but not sure if there is other geometry used.

Where can I find the beam width as well? Assuming that they will be different depending on the type of device on each of the buildings.

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