About the pull request

Now that #4716 's been merged, here's the changes I've wanted to make for eggs for a bit now.

• Eggs can no longer be planted in vehicles
• Eggs can no longer be planted on tiles that would obstruct the egg.

Explain why it's good for the game

• In the vast majority of cases, you cannot tell that a vehicle you're entering is infested with you-instantly-lose eggs. While normally getting hit with an egg is reasonably predictable (there are weeds == possibility of eggs), having no indication of it until you go inside and get hugged isn't fun or balanced.
• Eggs being able to layer under things like grass is technically a "feature", but not one I would like to keep. Traps serve the exact same purpose, but are much harder to mass produce (as intended). Eggs should be cheaper but more detectable, which doesn't align them being able to be near-fully hidden.

Testing Photographs and Procedure

Changelog

🆑
balance: You cannot plant eggs inside vehicles.
balance: Eggs can no longer be planted on tiles with objects that would obscure them.
/:cl: