fix version code error check dialog in game_score.js

add plugin, and matching external js file for the website, to fix known bad version codes
temporary change to the bad-version plugin, using internal list of fixes rather than externally loaded one
let's see if this works better for users...
report the version code when it doesn't need changing - useful to track down issues
improvments to plugin updater
- don't download a file twice if there is no updateURL (or if updateURL==downloadURL)
- use the downloadURL from the new meta file