Update package configuration and TypeScript settings; add build script, versioning, and output directories. Refactor NamedType equality check for conciseness. Change import statements to use 'type' for IDisposable in Disposable and DisposableList classes.

src/lang/Disposable.ts

@@ -1,4 +1,4 @@
-import IDisposable from './IDisposable';
+import type IDisposable from './IDisposable';
 
 export default class Disposable implements IDisposable {
   private readonly _cleanup: () => void;