runtime las/laz support

[unitycoder]

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

[unitycoder]

Now that i think about it, adding that source code into unity project would be easiest (since its .net 4.7 project, should work)
although need to think about:

• If its large cloud, need to save into some file anyway.. then its same as running the converter on the background?
• if its small file, could output to temp file or read directly into memory, and draw cloud