add intensity field : [x,y,z,intensity]

[gyubeomim]

I just added intensity fields in this plugin because I needed this field as a research purpose.

I haven't validated it many times, but It works well so far.

I'll fix any bugs in the future as soon as I find

[gyubeomim]

• sample pictures are like this

  

• and you need you setup velodyne vision sensor like this