Use regular grid for eyeplants

[228]

Right now it is very hard to predict where eyeplants are going to spawn exactly. They spawn around lureplant, but even if there's nothing taking up the space, they still dont spawn symmetrically. They also seem to spawn farther if space close to lureplant is not available (covered by manmade turf or plants). This makes it even harder to effectively use lureplant for farming twigs/grass. Regular grid should make them spawn in certain proximity of lureplant, in specific places, alligned both vertically/horizontally. If space is not available, eyeplant simply should not spawn (it shouldnt break grid placement). This way it will be possible to overlay eyeplant grid with grass/twigs grid, as well as make sure eyeplants always spawn in same places and collect all grass/twigs.