Huge refactoring to use new compiler and deprecate all other Packers

Add new PdfPacker

demo/demo26.js

@@ -0,0 +1,21 @@
+const docx = require('../build');
+const fs = require('fs');
+
+var doc = new docx.Document();
+
+var paragraph = new docx.Paragraph("Hello World");
+var institutionText = new docx.TextRun("University College London").bold();
+var dateText = new docx.TextRun("5th Dec 2015").tab().bold();
+paragraph.addRun(institutionText);
+paragraph.addRun(dateText);
+
+doc.addParagraph(paragraph);
+
+var packer = new docx.PdfPacker();
+
+packer.toBuffer(doc).then((buffer) => {
+    console.log(buffer);
+    fs.writeFileSync('My Document.pdf', buffer);
+});
+
+console.log('Document created successfully at project root!');