Mostly readding survival mechanics deleted in early Alpha. Also some cool new stuff.

Changes:

• splash changes
• added the Survival game mode, which you can select during world creation
• on the Survival mode the health bar is shown. Yet you can't take any damage.
• survival block breaking based on hardness. Yet you can't place blocks in survival mode
• blocks drop items when destroyed in survival mode
• blocks that undergo destruction in certain situations such as leaves or cacti now drop their respective items instead of disappearing completely
• improved terrain generation
• during world creation you can select which noise you want the terrain generation to be fed with. Applies only to the overworld generator.
• item entities do not stack on top of each other anymore

Noises and explainations:

• "Mixed" is the new Beta worldgen. It is a mix of Perlin noise with my function. It produces very nice, smooth terrain.
• "Perlin only" is the Alpha worldgen. You know, these bumpy mountains etc
• "Special" is solely my function. It generates cute mountains in nice intervals. Its only downside is that it's not random at all.
• "Cosine" basically uses the cos() function to generate the terrain. Really hilly. Use if you like mountains.
• "Tangent" uses the tan() function for terrain generation. The result is very interesting, and I don't recommend this for normal gameplay. Just for challenges.

"My function" presents like so:

f(x) = (sin(x)**2 + cos(x)) / 2

It it a mediane between a squared sine of x and a cosine of x.