Lots of updates. See changelog or commit description.

Updated slime flowers to grow on normal grass and made them grow faster.
Added mother lily pad that is found in swamps and spawns lily pads
nearby.
Added a test blender model and texture for the fish trap.
Temporarly removed grave model until blender model is ready.
Lots of updates to make the blast furnace work better.
--> Still some things missing for that.