add support for floating drawings

- added need elements and test for them

src/file/drawing/text-wrap/wrap-square.ts

@@ -0,0 +1,31 @@
+// http://officeopenxml.com/drwPicFloating-textWrap.php
+import { XmlComponent, XmlAttributeComponent } from "file/xml-components";
+import { TextWrapping, WrapTextOption } from ".";
+import { Distance } from "../drawing";
+
+interface IWrapSquareAttributes extends Distance {
+    wrapText?: WrapTextOption;
+}
+
+class WrapSquareAttributes extends XmlAttributeComponent<IWrapSquareAttributes> {
+    protected xmlKeys = {
+        distT: "distT",
+        distB: "distB",
+        distL: "distL",
+        distR: "distR",
+        wrapText: "wrapText",
+    };
+}
+
+export class WrapSquare extends XmlComponent {
+    constructor(textWrapping: TextWrapping) {
+        super("wp:wrapSquare");
+
+        this.root.push(
+            new WrapSquareAttributes({
+                wrapText: textWrapping.wrapTextOption || WrapTextOption.BOTH_SIDES,
+                ...textWrapping.distanceFromText,
+            }),
+        );
+    }
+}