Improve import alias

@file/ and @export/ instead of file/ and export/ etc

src/file/custom-properties/custom-properties-attributes.ts

@@ -1,4 +1,4 @@
-import { XmlAttributeComponent } from "file/xml-components";
+import { XmlAttributeComponent } from "@file/xml-components";
 
 export class CustomPropertiesAttributes extends XmlAttributeComponent<{
     readonly xmlns: string;

src/file/custom-properties/custom-properties.spec.ts

@@ -1,5 +1,7 @@
 import { expect } from "chai";
-import { Formatter } from "export/formatter";
+
+import { Formatter } from "@export/formatter";
+
 import { CustomProperties } from "./custom-properties";
 
 describe("CustomProperties", () => {

src/file/custom-properties/custom-properties.ts

@@ -1,4 +1,4 @@
-import { IContext, IXmlableObject, XmlComponent } from "file/xml-components";
+import { IContext, IXmlableObject, XmlComponent } from "@file/xml-components";
 import { CustomPropertiesAttributes } from "./custom-properties-attributes";
 import { CustomProperty, ICustomPropertyOptions } from "./custom-property";
 

src/file/custom-properties/custom-property-attributes.ts

@@ -1,4 +1,4 @@
-import { XmlAttributeComponent } from "file/xml-components";
+import { XmlAttributeComponent } from "@file/xml-components";
 
 export class CustomPropertyAttributes extends XmlAttributeComponent<{
     readonly fmtid: string;

src/file/custom-properties/custom-property.ts

@@ -1,4 +1,4 @@
-import { XmlComponent } from "file/xml-components";
+import { XmlComponent } from "@file/xml-components";
 import { CustomPropertyAttributes } from "./custom-property-attributes";
 
 export interface ICustomPropertyOptions {