Doesn't work with documents containing SmartArt/Charts and qrcode test enabled

Solution to <a href="https://github.com/edi9999/docxtemplater/issues/51">#51</a>
Created a new class ChartManager which allows Charts to be included in the document. It looks for all the charts in document, and create their respective r:id and link to a new Chart.xml file, which is exact copy of its parent. I took the liberty to reuse the methods from ImgManager and ImgReplacer classes.
I have created this for charts, but f you want to include any other SmartArt, just need to make few changes in the class, where you look for c:chart tag.
Note: These charts are static, just duplicate of their parent. However, since chart values can't be other than numeric, there is no possibility to insert tags, and generate them dynamically via JSON either. In future I'll add a solution to generate these charts via XML.