Refactor: Move code to function openCRXinViewer

The code is just indented,
 "openCRXinViewer(crx_url);",
 "function openCRXinViewer(crx_url) {" and
 "}" were added. No functional changes.
Let CRXtoZip accept File/Blob objects
Display a crx/zip file via the file chooser
Bump v1.2.2 - File chooser feature
Add online demo