feat: basic scenegraph, node, and spatial

Cargo.lock

@@ -66,6 +66,16 @@ dependencies = [
  "serde_derive",
 ]
 
+[[package]]
+name = "ctrlc"
+version = "3.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b37feaa84e6861e00a1f5e5aa8da3ee56d605c9992d33e082786754828e20865"
+dependencies = [
+ "nix",
+ "winapi",
+]
+
 [[package]]
 name = "dirs"
 version = "4.0.0"
@@ -193,6 +203,17 @@ dependencies = [
  "rand",
 ]
 
+[[package]]
+name = "nix"
+version = "0.24.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f17df307904acd05aa8e32e97bb20f2a0df1728bbc2d771ae8f9a90463441e9"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -349,9 +370,11 @@ name = "stardust-xr"
 version = "0.9.0"
 dependencies = [
  "anyhow",
+ "ctrlc",
  "libstardustxr",
  "mio",
  "slab",
+ "thiserror",
 ]
 
 [[package]]