Cleanup

svornostrequested to merge
svornost/fc-pregmod:pregmod-master into pregmod-master
  1. Remove twine art files that aren't used anymore
  2. Remove obsolete widgets <<CorpDevBuySell>> (unused since corp upgrade), and <<CreateSlaveByOrigin>> and <<AddMarketOrigins>> (which have never been used AFAICT, but are now broken anyway).
  3. Remove the no-usedOnce flag for BackwardsCompatibility.tw since it's now just a shell around the new JS BC stuff and no longer needs to be exempt.
  4. Remove corp variables from the OnlyUsedOnce exclusion list because the one place they were used doesn't exist anymore.

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