Implement all logic on the client side in csvxmlV2.js

For completing the rewrite, translations and some UI work are still
needed.

See #14

public/assets/js/jszip/.codeclimate.yml

@@ -0,0 +1,16 @@
+---
+engines:
+  duplication:
+    enabled: true
+    config:
+      languages:
+      - javascript
+  eslint:
+    enabled: true
+  fixme:
+    enabled: true
+ratings:
+  paths:
+  - "lib/*.js"
+exclude_paths:
+- "dist/*"