Reverted egg image in first level
Revert "Update to SQUIRREL 3.0.4"

This reverts commit bc25f6fa2616df7e905fed68ceb4e3ebc186a623.
The reason for rolling back to squirrel 2.2.5 is that something in 3.0.4 is causing new worldmap save files to have the wrong structure resulting in level completion data not being saved for new games.