libing64/dual_prisms_scanner

lidar scan pattern

https://msadowski.github.io/livox-mid40-review/
https://www.livoxtech.com/

Interesting scan pattern!!

![image](https://github.com/libing64/risley_prisms/blob/master/data/K_1.0_theta_2.0_M_-10.0.png)
![image](https://github.com/libing64/risley_prisms/blob/master/data/K_1.0_theta_2.0_M_-20.0.png)
![image](https://github.com/libing64/risley_prisms/blob/master/data/K_1.2_theta_2.0_M_-50.0.png)