Fix primordial planet entity issue.

small addition for the related planet modifier, add some negative effects to represent harsh environment better

- tile blockers are added to candidate planets
- crisis event are handled to turn cleared planet also to new candidate classes

Thanks to King of LP for pointing on that

Fix the name of special modifier

This is big update after initial release. I've added 2 more terraforming candidates, one from toxic planet and another from cold barren planet. Russian localization was added.

Candidates can be terraformed to all planet types for now

Upload mod picture.

Initial Upload