Pre-Release 3.99.4.0

Consider this as 'rc1' for the following full '4.0.0.0' release.

• Translations updated: Polish, Portugese (Brazil). Thank you translators!

  Remember you can help with translations. Please see Translations.md

• Properly fix Linux code for when there's no X11 display available. This
  includes ensuring that the CLI tool EDMC.exe will run without issue, with or
  without an
  X11 display.

• The old 'anonymous' and custom 'uploaderID' options were taken out of
  the UI back in December 2018, but the settings lingered in the Windows
  Registry. Thus some users would still have been sending an anonymised or
  custom 'uploaderID' in EDDN messages with no easy way to de-activate this.

  The EDDN Relay has been forcefully anonymising uploaderID since March
  2018 anyway, so this is redundant. Thus the code that performs this
  anonymising has now been removed.

• There used to be an option to output commodities data in 'BPC' format, but
  the option for this was removed from the UI back in Dec 2016. A few small
  pieces of code lingered and they have now been removed. Any plugin that
  was passing COMMODITY_BPC to commodity.export() will now break.

• There have been general coding style cleanups made to companion.py. No
  functionality should have changed and cursory checks show no regressions.
  Please report any weirdness with the automatic checking and upload of
  commodities data.