Potree data fetching (Octree streaming) US:1,2

[gautegf]

User stories #1, #2
Implement Potree rendering with streaming, meaning set up a job that that fetches data from storage into the application for smooth rendering of the points.Need to figure out how to efficiently fetch only thte data we need. If we store datasets as they are now (per area), maybe possible to fetch all neighbouring areas to the one the camera is in?

Also not sure if we need an issue for rending the relevant areas of points, or if that happens automatically by potree.