add support for floating drawings

- added need elements and test for them

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

@@ -0,0 +1,33 @@
+// http://officeopenxml.com/drwPicFloating-textWrap.php
+import { XmlComponent, XmlAttributeComponent } from "file/xml-components";
+import { Distance } from "../drawing";
+
+interface IWrapTightAttributes {
+    distT?: number;
+    distB?: number;
+}
+
+class WrapTightAttributes extends XmlAttributeComponent<IWrapTightAttributes> {
+    protected xmlKeys = {
+        distT: "distT",
+        distB: "distB",
+    };
+}
+
+export class WrapTight extends XmlComponent {
+    constructor(distanceFromText?: Distance) {
+        super("wp:wrapTight");
+
+        distanceFromText = distanceFromText || {
+            distT: 0,
+            distB: 0,
+        };
+
+        this.root.push(
+            new WrapTightAttributes({
+                distT: distanceFromText.distT,
+                distB: distanceFromText.distB,
+            }),
+        );
+    }
+}