Take Glow context using Arc. (#1640)

This allows usage with a Glow context that is passed between threads.

Cargo.toml

@@ -37,3 +37,6 @@ opt-level = 2 # fast and small wasm, basically same as `opt-level = 's'`
 # opt-level = 3 # unecessarily large wasm for no performance gain
 
 # debug = true # include debug symbols, useful when profiling wasm
+
+[patch.crates-io]
+three-d = { git = "https://github.com/asny/three-d.git", rev = "7ac4f3e1e14335290e505a5799a0b88717474678" }