Day/Night update

• Day/Night cycles were added, with Daytime lasting 3 times as longer

** I don't know if I will keep this as the constant shadow generation from the moving sun seems to put a slight strain on the computer. I'll try to find a fix to this or at least reduce it**

• Health was added to trees, rocks, and metals so once the health depletes, that specific resource would disappear. Occasionally these resources will be regenerated to compensate. Upon being depleted, those resource objects  will spawn some extra resources.
• Added Bats, can attack player
• Made the block placement preview blue and not have collisions before actually placing it
• Trees produce some fruits along with wood upon being destroyed.