Added a couple of prestige upgrades to improve cash and essence gain in the late game.
Added ball of yarn! Play with your kittens with the yarn! You can click the ball of yarn 5 times to get a buff that doubles base grass value and essence gain for a couple minutes.
Added hay. Hay accumulates (up to 3) on the right side of the grass field. You can click the hay to feed your animals and gain a buff that also doubles base grass value and essence gain for 1 minute.
The game has a proper icon now instead of showing up as a generic windows exe icon in the taskbar.
Hopefully the game isn't too easy now... I might tweak the numbers in the future, we'll see how it goes.
