feat(scene): integrate standard DWG data

src/entities/mod.rs

@@ -5,6 +5,7 @@ pub mod common;
 pub mod dim_override;
 pub mod dimension;
 pub mod ellipse;
+pub mod extended;
 pub mod field;
 pub mod hatch;
 pub mod helix;
@@ -34,3 +35,4 @@ pub mod tolerance;
 pub mod traits;
 pub mod underlay;
 pub mod viewport;
+pub mod view_symbol;