Bring back continental world gen

Bring back the old continental world gen from before 1.7.2.

I've been going on a nostalgia trip lately and I eventually came across some Reddit posts which showed off the old continental world gen, and it made me realize just how huge oceans were back in the day!

Back then, the world was split into actual continents or landmasses, which were surrounded by big bodies of water that make current oceans look more like lakes.

After seeing comparison's of the old and new world gen, I can safely say that I prefer the old world gen, over the current one which has the world generate as an endless landmass with some big lakes sprinkled around.

With the return of continental world gen, we could get new boats which can carry either more players than a regular boat, or store more items, depending on which one the player wants.

It's not even necessary to change the default world gen. Add it as a world type or have it available in the options when you create a world. This way, anyone who wants to stick with the current world gen can do so without any problems, and anyone who wants to try something new or simply prefers the old continents can choose them if they wish.