Adjusted the world generation for WoodAndStone.
Adjusting beach generation.
Merge pull request #4 from esapetri/master

Lot of new trees. :-)
Refactored tree definitions.
Changed around the copper ore process.
Changed around the copper ore process.
Switching to defining workstation recipes by prefabs.
Separating CopperAndBronze from WoodAndStone.
Fixing issues after refactoring.
Extracting recipe in CopperAndBronze into prefab.
Renaming world generator.
Refactoring continues.
Increasing a chance of dropping twigs for leaves.
Adding working (but ugly) Twig Basket for storage of items/blocks.
Unsuring sand is not dropped.
Adding clay and also adding dependency on Machines for CopperAndBronze.
Clay, ClayHearth, Bricks, Brick blocks and Advanced Stonecrafting station.
Fixing incorrect block family name in prefab.
Trees can now be cut in many places. Something is buggy with detecting the tree shape still, but at least partially working.
Tweaking drops from trees, now that they can be killed with one hit.