add support for floating drawings

- added need elements and test for them

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

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+export * from "./text-wrapping";
+export * from "./wrap-none";
+export * from "./wrap-square";
+export * from "./wrap-tight";
+export * from "./wrap-top-and-bottom";

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

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+// http://officeopenxml.com/drwPicFloating-textWrap.php
+import { Distance } from "../drawing";
+
+export enum TextWrapStyle {
+    NONE,
+    SQUARE,
+    TIGHT,
+    TOP_AND_BOTTOM,
+}
+
+export enum WrapTextOption {
+    BOTH_SIDES = "bothSides",
+    LEFT = "left",
+    RIGHT = "right",
+    LARGEST = "largest",
+}
+
+export interface TextWrapping {
+    textWrapStyle: TextWrapStyle;
+    wrapTextOption?: WrapTextOption;
+    distanceFromText?: Distance;
+}

src/file/drawing/text-wrap/wrap-none.ts

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+// http://officeopenxml.com/drwPicFloating-textWrap.php
+import { XmlComponent } from "file/xml-components";
+
+export class WrapNone extends XmlComponent {
+    constructor() {
+        super("wp:wrapNone");
+    }
+}

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

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+// 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,
+            }),
+        );
+    }
+}

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

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+// 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,
+            }),
+        );
+    }
+}

src/file/drawing/text-wrap/wrap-top-and-bottom.ts

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