Revamped UI

Added Main Menu

Prototype save system for 1 world (most likely you won't be able to open these worlds in future updates)

Now uses installer instead of zip file

Water has been removed due to its way of generating, which will be tweaked in later updates (it didn't impact gameplay yet anyway, except for being an obstacle)

Building bug, resulting in placing buildings around the desired plot has been patched

Anyway, except next update in a little more than 5 days!