Massively faster and smoother distant terrain.

- Joining the server now shows the full landscape out to the horizon in about 3 minutes instead of slowly building over a long session, and your computer works far less hard doing it.
- Distant terrain now streams in continuously as you explore or fly - no more empty void opening up ahead of you, and no more waiting for big chunks of scenery to pop in all at once.
- Looking through a spyglass now quickly fills in extra detail exactly where you are looking.
- A small progress bar appears near the top of the screen while larger terrain syncs are running, and stays out of the way for quick ones.
- Fixed distant terrain flickering between sharp and blurry while loading, after toggling shaders, and on world reload.
- Fixed several cases where distant terrain could get stuck and stop updating until you reconnected.
