We don't need to encodeURIComponent at all when using blob links.
The data never goes into the dom directly, just a guid reference.
This makes saving with blobs very fast!
This should fix crashing on large wikis under chrome
see chrome bug: https://code.google.com/p/chromium/issues/detail?id=103234
This should also speed up generating the download html by a couple of seconds
it avoids repeatedly marshalling the base64 encoded href string across the sandbox boundary
it avoids some time and memory consumed by "large" dom manipulation
major remaining delay is in encodeURIComponent
TODO: consider using iconv on the server
TODO: consider async invocation of regular expressions to avoid client "lockup"
Conflicts:
core/modules/savers/download.js
