Better compatibility with Planetary Diversity.

Fixed Baol decision overwrite.

Added new event pictures for some events.
Associated precursor events with their event chains.
Strange Worlds Buildings can now be built on city districts.

Cleanup of unused event pictures.
Tweaked some modifiers.

Further code fixes.

Fixed some modifiers and added back the Roots event chain.

Updated for Stellaris 4.0.
The Roots event chain has been disabled until a further update.
The new systems should spawn more freely now, preventing some softlocks.

The start menu is now localized.

Added Spanish localization to the Ziaskehorn event thanks to Darh.
Tweaked solar system generation for new games.
Updated localization of the start menu.

Fixed detection of incohesive origin.