Dependency builds for plugos

packages/plugos/plug.ts

@@ -27,6 +27,9 @@ export class Plug<HookT> {
     this.manifest = manifest;
     // TODO: These need to be explicitly granted, not just taken
     this.grantedPermissions = manifest.requiredPermissions || [];
+    for (let [dep, code] of Object.entries(manifest.dependencies || {})) {
+      await this.sandbox.loadDependency(dep, code);
+    }
   }
 
   syscall(name: string, args: any[]): Promise<any> {