v0.3.0 - Point loads fully implemented

Wait, what?

• What was the previous release then?
• I was trying to be clever by treating point loads like they were "half" of a distributed load. That just created confusing results. So, I changed the implementation which changed the interface and now things just make more sense.
• Oh yeah, I added a "minimum spread distance" for point loads. The idea is that all point loads become some amount of distributed load as they travel through the wall. You can either use an angle spread or, if you want them to kind of come straight down but spread over some minimum distance, you can now specify the distance.