Alpha 0.1.8

Game improvements

Add Pinecone item
Reworked item drop system, items can now have a drop chance and quantity range. For example, a tree now will drop 2-3 woods 0-3 twigs and has a 20% chance to drop Pinecone.
Add possibility to plant trees.
Add different stages to trees.
Improved performance, now you can build more buildings with less impact on fps and cpu load.
Berry bush now drops 3-5 berries.
Sand Pie now drops 3-5 sand.
Dead bush now drops 1-3 twigs.
Boulder now drops 2-5 stones.
Coal boulder now drops 3-5 coal and 0-3 stone.
Iron boulder now drops 3-5 iron ore and 0-5 stone.