Add SymbolRun to allow adding symbols inline

src/file/paragraph/run/run-components/symbol.spec.ts

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+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+
+import { Symbol } from "./symbol";
+
+describe("Symbol", () => {
+    describe("#constructor", () => {
+        // Note: if no character is given, the output is a MS Windows logo
+        it("creates an empty symbol run if no character is given", () => {
+            const s = new Symbol();
+            const f = new Formatter().format(s);
+            expect(f).to.deep.equal({ "w:sym": { _attr: { "w:char": "", "w:font": "Wingdings" } } });
+        });
+
+        it("creates the provided symbol with default font", () => {
+            const s = new Symbol("F071");
+            const f = new Formatter().format(s);
+            expect(f).to.deep.equal({ "w:sym": { _attr: { "w:char": "F071", "w:font": "Wingdings" } } });
+        });
+
+        it("creates the provided symbol with the provided font", () => {
+            const s = new Symbol("F071", "Arial");
+            const f = new Formatter().format(s);
+            expect(f).to.deep.equal({ "w:sym": { _attr: { "w:char": "F071", "w:font": "Arial" } } });
+        });
+    });
+});

src/file/paragraph/run/run-components/symbol.ts

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+import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
+
+interface ISymbolAttributesProperties {
+    readonly char: string;
+    readonly symbolfont?: string;
+}
+
+class SymbolAttributes extends XmlAttributeComponent<ISymbolAttributesProperties> {
+    protected readonly xmlKeys = {
+        char: "w:char",
+        symbolfont: "w:font",
+    };
+}
+
+export class Symbol extends XmlComponent {
+    constructor(char: string = "", symbolfont: string = "Wingdings") {
+        super("w:sym");
+        this.root.push(new SymbolAttributes({ char: char, symbolfont: symbolfont }));
+    }
+}