Move struct out of model folder.

src/structure/spec_model/BaseModel.struct.ts

@@ -0,0 +1,19 @@
+import { BaseFileStructure } from '../BaseFileStructure'
+import { SpecModelStructure } from './SpecModelStructure'
+
+export abstract class BaseModelStructure<T> extends BaseFileStructure implements SpecModelStructure<T[]> {
+
+    protected resolvedModels: T[] | undefined
+
+    constructor(
+        absoluteRoot: string,
+        relativeRoot: string,
+        structRoot: string,
+        protected baseUrl: string
+    ) {
+        super(absoluteRoot, relativeRoot, structRoot)
+    }
+
+    public abstract async getSpecModel(): Promise<T[]>
+
+}