Patch Notes: Smoother frames in busy towns

Performance

Towns full of furnished yards are cheaper to draw. Yard pieces behind you are no longer drawn, and many copies of the same placed piece no longer force extra shadow work every frame.
The stables and wagon yards in every town you can see are no longer drawn when they are behind you or far out of view.
Collision no longer gets more expensive as you raise the view distance. Movement for you and every nearby foe costs about the same at Ultra as at Low, including while new land is loading in.
A lamp's shadow no longer redraws all six of its sides when someone walks past it. It redraws only the sides they are in front of.
Other players' name tags are cheaper for the browser to move when you turn the camera in a crowd.
The game's main per-frame loop now runs as optimized code in the browser.

PERF-PRIORITY: the world frame under V8's ceiling; placed pieces, shadow copies and the collider no longer scale with yards and render range by @Lattymoy in #752

Full Changelog: app-v0.1.7556...app-v0.1.7567