Add a Progressive Collapse Module to RAM SS

Similar to having handles on area loads, the ability to graphically move line (and point) loads would be really really helpful.

Floorvibe version 3.1 utilizes analysis procedures in the 2nd Edition of AISC Design Guide 11, while version 3.0 is based on the 1st Edition. Calculations based on the 1st edition tend to underpredict vibration for walker paces less than 100 steps...