runtime las/laz support #119

no runtime las/laz support yet.

workarounds:

• include commandline converter with your build and call that..
• or use the commandline converter source code to read las/laz in your project and then feed that point data into viewer (using example scene PointCloud-YourOwnData.scene)

*Example script for runtime commandline convert:
https://github.com/unitycoder/UnityPointCloudViewer/blob/master/Extras/Scripts/RuntimeLASConvert.cs