Rebalances crops to be more realistic. Grains must be shelled, root vegetables (and cabbage) can be replanted. (at some point i will include fruit trees but i haven't decided how to implement that yet)

You might think this is cheesing the game for some crops or "making it too easy" but its more realistic. I don't like artifically inflated difficulty just to make things more "gamey".

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INSTRUCTIONS
- Rooting vegetables and cabbage only give their produce, but each produce item (an onion, a turnip, etc.) can be crafted in the inventory menu into one seed each. ("replanting")
- Grain crops now only give seeds as a harvest, and each seed can be exchanged in the inventory screen for grain ("threshing")
- Legume plants only give legumes as a harvest and each legume can be crafted in inventory for a few seeds ("shelling")
- Pumpkin slices and pumpkin blocks can be crafted into many seeds in the inventory screen (half of this was already in vanilla)

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VERSION 1.0.1
- partially buffed root vegetable harvests ( 5 - 16)

VERSION 1.0.0
- Corrected multiple syntax errors
- Removed fruit (fruit trees apparently don't need seeds)
- Corrected a few logic errors
- Tested and Released

VERSION 0
- removes varying drops from most crops. Cereal crops drop only seeds, legumes drops only legumes, root vegetables drop only roots.
- no changes were made to fruit drops, but i might try that later
- each grain seed can be crafted into edible grain (think threshing)
- each legume can be crafted into a few seeds (think opening the bean pods)
- root vegetables can be crafted into a single seed each (think replanting bulbs or roots)
- fruits and fruit-like vegetables including pumpkins can be harvested for many seeds